KR20200096144A - Laminate, laminate with adhesive layer, optical laminate with substrate layer, optical laminate, and method for manufacturing the same - Google Patents

Abstract

Provided are a laminate, a laminate with an adhesive layer, an optical laminate with a substrate layer, an optical laminate, and a manufacturing method thereof, wherein the laminate is suitable for manufacturing the optical laminate with a liquid crystal layer in which generation of corrugations and atypical foreign substances is suppressed when the liquid crystal layer is transferred to an optical function layer. The laminate has a first liquid crystal layer containing layer including a first liquid crystal layer on a substrate layer containing layer including the substrate layer. The substrate layer containing layer enables delamination with respect to the first liquid crystal layer containing layer. The first liquid crystal layer includes a liquid crystal compound arranged in a horizontal direction with respect to a surface of the first liquid crystal layer. The displacement amount in a puncture test of the first liquid crystal layer containing layer is 2.0 mm or less.

Description

Laminate, laminate with adhesive layer, optical laminate with substrate layer, optical laminate, and manufacturing method thereof {LAMINATE, LAMINATE WITH ADHESIVE LAYER, OPTICAL LAMINATE WITH SUBSTRATE LAYER, OPTICAL LAMINATE, AND METHOD FOR MANUFACTURING THE SAME}

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

In a display device such as an organic EL display device or a liquid crystal display device, in order to prevent reflection of external light, an elliptically polarizing plate in which a linear polarizing plate and a retardation plate are laminated is sometimes used. As a retardation plate constituting this elliptically polarizing plate, a layer obtained by curing a polymerizable liquid crystal compound (liquid crystal layer) or a retardation plate including a laminate thereof is known. Patent Document 1 describes a method of laminating the liquid crystal layer on a linear polarizing plate by a transfer method in which a liquid crystal layer horizontally aligned with respect to the surface of the substrate is formed on a substrate and transferred to a linear polarizing plate.

Patent Document 1: Japanese Patent Application Publication No. 2015-21976

In such a horizontally aligned liquid crystal layer, when transferring from a substrate to a linearly polarizing plate, there has been a problem that wrinkles and irregular foreign matters are liable to occur from the end portions. Patent Document 1 describes a method of suppressing the occurrence of foreign matter by adjusting the width relationship between the adhesive layer and the liquid crystal layer, but it is not an effective method when it is difficult to adjust the width relationship.

The present invention is a laminate suitable for producing an optical laminate having a liquid crystal layer in which wrinkles and irregularities are suppressed from occurring when a liquid crystal layer is transferred to an optical functional layer, a laminate with an adhesive layer, and an optical laminate with a base layer , An object of the present invention is to provide an optical laminate and a method for producing the same.

The present invention provides a laminate shown below, a laminate with an adhesive layer, an optical laminate with a base layer, an optical laminate, and a method for producing the same.

[1] A laminate in which a first liquid crystal layer-containing layer including a first liquid crystal layer is provided on a base layer-containing layer including a base layer,

The base material layer-containing layer can be peeled off from the first liquid crystal layer-containing layer,

The first liquid crystal layer includes a liquid crystal compound aligned in a horizontal direction with respect to the surface of the first liquid crystal layer,

The amount of displacement in the protrusion test of the first liquid crystal layer-containing layer is 2.0 mm or less.

[2] The laminate according to [1], wherein the adhesion between the substrate layer-containing layer and the first liquid crystal layer-containing layer is 0.05 N/25 mm or more.

[3] The base layer-containing layer further includes an alignment layer,

The laminate according to [1] or [2], wherein the first liquid crystal layer-containing layer is provided on the side of the alignment layer of the base layer-containing layer.

[4] The first liquid crystal layer-containing layer further includes an alignment layer,

The layered product according to [1] or [2], wherein the base layer-containing layer is provided on the side of the alignment layer of the first liquid crystal layer-containing layer.

[5] A laminate with an adhesive layer comprising the laminate according to any one of [1] to [4] and an adhesive layer,

The adhesive layer is laminated on the side of the first liquid crystal layer-containing layer of the laminate,

The first liquid crystal layer-containing layer has an adhesive layer-equipped laminate having an unlaminated region in which the adhesive layer is not laminated.

[6] The laminated body with an adhesive layer according to claim [5], wherein the unlaminated region is present at at least one end portion in the width direction of the laminated body with an adhesive layer.

[7] An optical laminate with a base layer comprising the laminate according to any one of [1] to [4], an adhesive layer, and an optical functional layer in this order,

The adhesive layer is an optical laminate with a base layer provided on the side of the first liquid crystal layer-containing layer of the laminate.

[8] An optical laminate with a base layer in which an optical functional layer is provided on the adhesive layer of the laminate with an adhesive layer according to [5] or [6].

[9] The optical laminate provided with the base layer according to [7] or [8], wherein the optical functional layer includes a polarizing layer.

[10] The optical laminated body with a base layer according to any one of [7] to [9], wherein the optical functional layer includes a second liquid crystal layer.

[11] An optical laminate comprising a first' liquid crystal layer-containing layer including a first' liquid crystal layer, an adhesive layer, and an optical functional layer in this order,

The first' liquid crystal layer includes a liquid crystal compound aligned in a horizontal direction with respect to the surface of the first' liquid crystal layer,

An optical laminate having a displacement amount of the first' liquid crystal layer-containing layer in a protrusion test of 2.0 mm or less.

[12] The first' liquid crystal layer-containing layer further includes an alignment layer,

The optical laminate according to [11], wherein the alignment layer is provided on the side opposite to the adhesive layer of the first' liquid crystal layer.

[13] A method for producing an optical laminate comprising a first' liquid crystal layer-containing layer including a first' liquid crystal layer, an adhesive layer, and an optical functional layer in this order,

A method for producing an optical laminate comprising a step of peeling the substrate layer-containing layer from the substrate layer-equipped optical laminate according to any one of [7] to [10].

According to the present invention, when transferring a liquid crystal layer to an optical functional layer, a laminate suitable for manufacturing an optical laminate having a liquid crystal layer in which wrinkles and irregularities are suppressed is suppressed, a laminate with an adhesive layer, and an optical with a base layer. A laminate, an optical laminate, and a manufacturing method thereof can be provided.

1 is a schematic cross-sectional view schematically showing an example of a laminate of the present invention.
2 is a schematic cross-sectional view schematically showing another example of the laminate of the present invention.
3 is a schematic cross-sectional view schematically showing an example of a laminate with an adhesive layer of the present invention.
4 is a schematic cross-sectional view schematically showing an example of an optical laminate with a base layer of the present invention.
5 is a schematic cross-sectional view schematically showing another example of the optical laminate with a base layer of the present invention.
6 is a schematic cross-sectional view schematically showing an example of the manufacturing process of the optical laminate of the present invention.
7 is a schematic cross-sectional view schematically showing another example of the manufacturing process of the optical laminate of the present invention.

Hereinafter, preferred embodiments of the laminate of the present invention, the laminate with an adhesive layer, the optical laminate with the base layer, the optical laminate and a method for producing the same will be described with reference to the drawings. In addition, each embodiment shown below and its modified example may be combined arbitrarily. In addition, in each embodiment and its modifications, the same reference numerals are used for members that are the same as those described in the previous embodiments or modifications thereof, and the description thereof may be omitted.

[Embodiment 1 (laminate)]

1 is a schematic cross-sectional view schematically showing an example of a laminate of the present embodiment. In the drawing, W represents the width direction. In the laminate 1a of this embodiment, as shown in FIG. 1, the 1st liquid crystal layer 13a (the 1st liquid crystal layer containing layer) on the base material layer containing layer 10a containing the base material layer 11a There is. The base layer-containing layer 10a may include a base layer 11a and an alignment layer 12a, as shown in FIG. 1, and the first liquid crystal on the side of the alignment layer 12a of the base layer-containing layer 10a A layer 13a is provided, and the first liquid crystal layer 13a is in direct contact with the alignment layer 12a. The first liquid crystal layer 31a includes a liquid crystal compound that is aligned in a horizontal direction with respect to the surface. In addition, the substrate layer-containing layer 10a can be peeled off from the first liquid crystal layer 13a. The laminate 1a may have another layer further on the first liquid crystal layer 13a. The layered product 1a may be a single-leafed film or a long film.

In the cross section in the width direction of the laminate 1a, as shown in Fig. 1, the length in the width direction is shortened in the order of the base layer 11a, the alignment layer 12a, and the first liquid crystal layer 13a. In addition, the positions of both ends of the alignment layer 12a in the width direction are inside the width direction than the positions of both ends of the base layer 11a in the width direction, and the positions of both ends of the first liquid crystal layer 13a in the width direction are the alignment layers 12a. ) Is located inside the width direction than at both ends in the width direction. In addition, the laminated body 1a is not limited to those in which the length of each layer in the width direction and the positions of both ends of each layer in the width direction are in the above-described relationship. For example, the base layer 11a and the alignment layer 12a may have the same length in the width direction, and the positions of both ends in the width direction may be the same in the cross section of the laminate 1a in the width direction. In addition, the alignment layer 12a and the first liquid crystal layer 13a may have the same length in the width direction, and the positions of both ends in the width direction may be the same in the cross-section in the width direction of the laminate 1a, and the length in the width direction The alignment layer 12a may be shorter than the first liquid crystal layer 13a, and the positions of both ends of the alignment layer 12a in the width direction may be inside the width direction than the positions of both ends in the width direction of the first liquid crystal layer 13a. . Moreover, although the laminated body 1a shown in FIG. 1 has a structure symmetric in the width direction, it may have a structure which is asymmetric in the width direction.

The base layer 11a may function as a support layer supporting the alignment layer 12a and the first liquid crystal layer 13a. The alignment layer 12a may have an alignment regulating force for liquid crystal alignment of a liquid crystal compound used to form the first liquid crystal layer 13a in a horizontal direction.

The first liquid crystal layer 13a may be formed by polymerization of a polymerizable liquid crystal compound (liquid crystal compound). For example, for forming a liquid crystal layer including a polymerizable liquid crystal compound on the alignment layer 12a of the base layer-containing layer 10a The composition is applied and dried, and the polymerizable liquid crystal compound is polymerized and cured by irradiation with active energy rays such as ultraviolet rays in a state in which the polymerizable liquid crystal compound is oriented horizontally with respect to the surface of the first liquid crystal layer 13a. can do. The first liquid crystal layer 13a may have a single layer structure, but may have a multilayer structure of two or more layers.

The first liquid crystal layer 13a has a displacement amount of 2.0 mm or less in a piercing test, preferably 1.5 mm or less, 1.2 mm or less, 1.1 mm or less, and 0 (zero) mm or more, It is usually 0.1 mm or more, preferably 0.3 mm or more, and more preferably 0.5 mm or more. If the amount of displacement in the protrusion test is too small, problems such as cracks tend to occur during processing such as polishing. In addition, by setting the displacement amount in the piercing test in the range of 0.5 mm or more and 2.0 mm or less, the occurrence of foreign matters during transfer of the first liquid crystal layer 13a can be effectively suppressed, and processing aptitude is excellent in processing such as polishing. It becomes easy to form the first liquid crystal layer 13a. The amount of displacement in the piercing test can be measured using a piercing tester as described in Examples to be described later.

The laminate 1a is used to obtain an optical laminate 3a (FIG. 4) with a substrate layer having an adhesive layer 30a and an optical functional layer 60a as described later, but this substrate layer optical lamination By peeling the base material layer-containing layer 10a from the sieve 3a, the optical laminate 4a (Fig. 6) can be obtained. If the displacement amount in the protrusion test of the first liquid crystal layer 13a containing the horizontally aligned liquid crystal compound is 2.0 mm or less, the base layer-containing layer 10a is peeled from the base layer-equipped optical laminate 3a as described above. In this case, the laminated region 13ay of the first liquid crystal layer 13a, which is the region where the adhesive layer 30a is laminated, and the unlaminated region 13ax, which is the region where the adhesive layer 30a is not laminated (in FIG. 4, The first liquid crystal layer 13a can be satisfactorily separated between the portions indicated by the diagonal line rising to the right).

On the other hand, if the displacement amount in the protrusion test of the first liquid crystal layer 13a exceeds 2.0 mm, the first liquid crystal layer 13a becomes easily elongated, and thus the substrate layer-containing layer from the optical laminate 3a provided with the substrate layer When peeling (10a), the first liquid crystal layer 13a is not separated at an intended position such as between the laminated region 13ay and the unlaminated region 13ax, and the separated part becomes an irregular foreign material, Problems such as wrinkles are likely to occur in the part.

The amount of displacement in the protrusion test of the first liquid crystal layer 13a is, for example, the type of the polymerizable liquid crystal compound used to obtain the first liquid crystal layer 13a containing the horizontally aligned liquid crystal compound, and the first liquid crystal layer 13a The degree of polymerization (curing degree) of the polymerizable liquid crystal compound in the first liquid crystal layer 13a, the kind or amount of additives such as polymerization initiators, reactive additives, leveling agents, polymerization inhibitors, and crosslinking agents, and the first liquid crystal layer It can be adjusted by the thickness of (13a). When the conditions other than the thickness of the first liquid crystal layer 13a are the same, the larger the thickness, the more difficult it is to elongate, and the amount of displacement of the first liquid crystal layer 13a in the protrusion test tends to decrease. The thickness of the first liquid crystal layer 13a can be appropriately selected depending on the type of display device to be applied, but is preferably 0.3 µm or more, 0.5 µm or more, 1 µm or more, and usually 10 µm or less. , 5 µm or less may be sufficient, and 3 µm or less is preferable.

The adhesion between the substrate layer-containing layer 10a and the first liquid crystal layer 13a is preferably 0.05 N/25 mm or more, 0.06 N/25 mm or more, 0.07 N/25 mm or more, and 0.08 N/ 25 mm or more may be sufficient, and 0.10 N/25 mm or more may be sufficient. The upper limit of the adhesion between the substrate layer-containing layer 10a and the first liquid crystal layer 13a is not particularly limited as long as the substrate layer-containing layer 10a can be peeled from the first liquid crystal layer 13a. For example, 0.5 N/25 It can be less than mm. The adhesion can be measured by the method described in Examples to be described later.

When the adhesion between the substrate layer-containing layer 10a and the first liquid crystal layer 13a is less than 0.05 N/25 mm, when peeling the substrate layer-containing layer 10a from the substrate layer-equipped optical laminate 3a described later, lamination It becomes difficult to separate the first liquid crystal layer 13a satisfactorily between the region 13ay and the unlaminated region 13ax, so that the above-described problem is likely to occur.

The adhesion between the substrate layer-containing layer 10a and the first liquid crystal layer 13a is a polymerization initiator, reactive additive, leveling agent, polymerization inhibitor, crosslinking agent, etc. contained in the alignment layer 12a or the first liquid crystal layer 13a. It can be adjusted by the type or amount of additives. In addition, the adhesion is corona treatment performed on the surface of the substrate layer 11a on the side of the alignment layer 12a, the surface of the alignment layer 12a, and the surface of the first liquid crystal layer 13a on the side of the alignment layer 12a. , It can also be adjusted by surface treatment, such as plasma treatment and flame treatment.

The laminate of the present embodiment may be changed as in the modified example shown below.

(Modification 1 of Embodiment 1)

In the above, as shown in Fig. 1, the base layer-containing layer 10a has been described by taking the laminate 1a including the base layer 11a and the alignment layer 12a as an example, but the base layer-containing layer is an alignment layer ( 12a) may not be included, and may be, for example, a laminate shown in Fig. 2. 2 is a schematic cross-sectional view schematically showing another example of the laminate of the present embodiment. As shown in FIG. 2, the laminate 1b is a first liquid crystal layer 13b containing an alignment layer 12b and a horizontally aligned liquid crystal compound on the base layer 11b (substrate layer containing layer) The first liquid crystal layer-containing layer 20b having a is provided, and the base layer 11b is provided on the side of the alignment layer 12b of the first liquid crystal layer-containing layer 20b. The first liquid crystal layer 13b is in direct contact with the alignment layer 12b. In addition, the substrate layer 11b constituting the laminate 1b can be peeled from the first liquid crystal layer-containing layer 20b.

In the layered product 1b, the amount of displacement in the protrusion test of the first liquid crystal layer-containing layer 20b having the first liquid crystal layer 13b containing the horizontally aligned liquid crystal compound can be 2.0 mm or less. Since the range that can be adopted as the displacement amount of the first liquid crystal layer-containing layer 20b in the protrusion test is the same as the range described in the above-described embodiment, the description thereof is omitted. As a method of adjusting the displacement amount in the piercing test of the first liquid crystal layer-containing layer 20b, as described in the above-described embodiment, in addition to the method of adjusting the displacement amount in the piercing test of the first liquid crystal layer, the alignment layer It can also be adjusted by the kind and amount of the component contained in (12b), the thickness of the orientation layer 12b, etc. When the conditions other than the thickness of the first liquid crystal layer-containing layer 20b are the same, the larger the thickness, the more difficult it is to elongate, and the amount of displacement in the protrusion test of the first liquid crystal layer-containing layer 20b tends to decrease. The thickness of the first liquid crystal layer-containing layer 20b can be appropriately selected depending on the type of display device to be applied, but it is preferably 0.4 µm or more, and may be 1 µm or more, usually 12 µm or less, and 8 µm or less. And it is more preferable that it is 5 micrometers or less. In addition, the thickness of the first liquid crystal layer 13b is preferably 0.3 µm or more, 0.5 µm or more, 1 µm or more, and usually 10 µm or less, 5 µm or less, and 3 µm or less. . The thickness of the alignment layer 12b is preferably 0.01 µm or more, 0.05 µm or more, and usually 10 µm or less, 3 µm or less, and 0.5 µm or less.

The laminate 1b is also used to obtain an optical laminate with a substrate layer having an adhesive layer and an optical laminate, and the optical laminate 4b described later by peeling the substrate layer 11b from the optical laminate with the substrate layer (Fig. 7) can be obtained. When the displacement amount in the protrusion test of the first liquid crystal layer-containing layer 20b containing the horizontally aligned liquid crystal compound is 2.0 mm or less, as described above, when the substrate layer is peeled from the optical laminate with the substrate layer, the first The first liquid crystal layer-containing layer 20b can be satisfactorily separated between the laminated region of the liquid crystal layer-containing layer 20b, which is the region in which the adhesive layer is laminated, and the unlaminated region, which is the region in which the adhesive layer is not laminated. On the other hand, when the displacement amount in the protrusion test of the first liquid crystal layer-containing layer 20b exceeds 2.0 mm, the first liquid crystal layer-containing layer 20b becomes easily elongated, and thus the base layer 11b from the optical laminate with the base layer ) When peeling off, the first liquid crystal layer-containing layer 20b is not separated at an intended position such as between the stacked region 13ay and the unlaminated region 13ax, the separation part becomes an irregular foreign material, and the separation part Problems such as wrinkles are likely to occur. The preferable range of the displacement amount in the piercing test of the first liquid crystal layer-containing layer 20b can be the same as the preferable range of the displacement amount in the piercing test of the first liquid crystal layer 13a described above.

In addition, it is preferable that the adhesion between the substrate layer 11b and the first liquid crystal layer-containing layer 20b is 0.05 N/25 mm or more. The range that can be further adopted as this adhesive force is the same as the range described in the above-described embodiment, and the adjustment method thereof is also the same as the range described in the above-described embodiment, and the description thereof is omitted. When the adhesion between the substrate layer 11b and the first liquid crystal layer-containing layer 20b is less than 0.05 N/25 mm, when peeling the substrate layer 11b from the optical laminate with the substrate layer, the layered region and the unlaminated region are It becomes difficult to separate the first liquid crystal layer-containing layer 20b satisfactorily therebetween, and the above-described problem is liable to occur. The preferred range of adhesion between the base layer 11b and the first liquid crystal layer-containing layer 20b may be the same as the preferred range of the adhesion between the base layer-containing layer 10a and the first liquid crystal layer 13a.

(Modification 2 of Embodiment 1)

In the laminated body 1a and the laminated body 1b shown in Figs. 1 and 2, the case where the alignment layer is included has been described as an example, but the laminate may not contain an alignment layer.

[Embodiment 2 (Laminated Body with Adhesive Layer)]

3 is a schematic cross-sectional view schematically showing an example of a laminate with an adhesive layer according to the present embodiment. In the drawing, W represents the width direction. As shown in FIG. 3, the laminated body 2a with an adhesive layer of this embodiment has the laminated body 1a and the adhesive layer 30a shown in FIG. 1, The adhesive layer 30a is the laminated body 1a. It is provided on the side of the first liquid crystal layer 13a. The adhesive layer 30a is a layer formed of an adhesive or an adhesive. The laminated body 1a is described in the previous embodiment, and the laminated body 2a with an adhesive layer forms an adhesive layer 30a by, for example, applying an adhesive or an adhesive on the laminated body 1a or transferring the adhesive layer. You can get it. The laminated body 2a with an adhesive layer may have a release layer covering the surface of the adhesive layer 30a on the opposite side to the first liquid crystal layer 13a. The laminated body 2a provided with an adhesive layer may be a sheet film or a long film.

As shown in FIG. 3, the adhesive layer 30a is shorter in the width direction than the first liquid crystal layer 13a in the cross section in the width direction of the adhesive layer-equipped laminate 2a, and the adhesive layer 30a The positions of both ends in the width direction are inside the width direction than the positions of both ends in the width direction of the first liquid crystal layer 13a. In addition, the first liquid crystal layer 13a includes a laminated region 13ay, which is a region in which the adhesive layer 30a is laminated, and an unlaminated region 13ax, which is a region in which the adhesive layer 30a is not laminated (in FIG. It has a part indicated by a rising diagonal line). As shown in Fig. 3, by providing unlaminated regions 13ax at both ends of the first liquid crystal layer 13a in the cross-section in the width direction of the adhesive layer-equipped laminate 2a, the adhesive layer-equipped laminate 2a or In the optical laminate 3a with a base layer described later (FIG. 4) obtained using the laminate 1a or the laminate 2a with an adhesive layer, the adhesive layer is difficult to protrude, and when conveying it, by the adhesive layer. Contamination of the conveying path can be suppressed.

In addition, the adhesive layer 30a in the adhesive layer-equipped laminate 2a is provided on the first liquid crystal layer 13a, and the laminated region 13ay and the unlaminated region 13ax are provided on the first liquid crystal layer 13a. As long as it can form, it is not limited to the structure of the laminated body 2a with an adhesive layer shown in FIG. For example, one end of the adhesive layer 30a in the width direction may be at the same position as the end of one end of the first liquid crystal layer 13a in the width direction. In addition, when viewed from the top of the first liquid crystal layer 13a, an adhesive layer 30a is formed on the first liquid crystal layer 13a so that an unlaminated region is formed in the center and a laminated region surrounding the unlaminated region is formed. You may prepare. In addition, the first liquid crystal layer 13a only needs to have at least one stacked region 13ay and one unlaminated region 13ax, and may have two or more, respectively, and the stacked region 13ay and the unlaminated region 13ax The numbers may be the same or different.

The adhesive layer-equipped laminate 2a is used to obtain the substrate layer-equipped optical laminate 3a (Fig. 4) having the optical functional layer 60a as described later, but this substrate layer-equipped optical laminate 3a ) By peeling the substrate layer-containing layer 10a, the optical laminate 4a (Fig. 6) can be obtained. Since the laminated body 2a with an adhesive layer contains a liquid crystal compound that is horizontally aligned and has a first liquid crystal layer 13a having a displacement amount of 2.0 mm or less in a piercing test, as described above, When peeling the base material layer-containing layer 10a from the laminate 3a, the first liquid crystal layer 13a is preferably formed between the laminated region 13ay of the first liquid crystal layer 13a and the unlaminated region 13ax. Can be separated.

In addition, in the laminated body 2a with the adhesive layer, since the adhesion between the substrate layer-containing layer 10a and the first liquid crystal layer 13a is 0.05 N/25 mm or more, the laminated region 13ay of the first liquid crystal layer 13a ) And the unlaminated region 13ax, the first liquid crystal layer 13a can be well separated.

The laminated body with an adhesive layer of this embodiment may be changed like the modification example shown below.

(Modified Example 1 of Embodiment 2)

In the above, the laminated body 2a with an adhesive layer having the laminated body 1a and the adhesive layer 30a shown in Fig. 1 has been described as an example, but the laminated body 1b shown in Fig. 2 may be used. The laminate with an adhesive layer using the laminate 1b is used to obtain an optical laminate with a substrate layer having an optical functional layer described later, and a substrate layer 11b (substrate layer-containing layer) from the optical laminate with a substrate layer By this peeling, the optical laminated body 4b (FIG. 7) mentioned later can be obtained. In the laminate with an adhesive layer using the laminate 1b, the displacement amount in the protrusion test of the first liquid crystal layer-containing layer 20b having the first liquid crystal layer 13b containing a horizontally aligned liquid crystal compound is 2.0 mm or less Thus, when peeling the base layer 11b from the base layer-equipped optical laminate, between the first liquid crystal layer-containing layer 20b, a laminated region, which is a region in which an adhesive layer is provided, and an unlaminated region, which is a region in which the adhesive layer is not provided. In, the first liquid crystal layer-containing layer 20b can be separated satisfactorily. In addition, when the adhesion between the substrate layer 11b and the first liquid crystal layer-containing layer 20b is 0.05 N/25 mm or more, when peeling the substrate layer 11b from the optical laminate with the substrate layer, the laminated region and the unlaminated layer It becomes easy to separate the first liquid crystal layer-containing layer 20b satisfactorily between regions.

(Modified Example 2 of Embodiment 2)

The above has been described by taking an example of a laminate with an adhesive layer including an alignment layer, but the laminate with an adhesive layer may not contain an alignment layer.

[Embodiment 3 (optical laminate with base layer)]

4 is a schematic cross-sectional view schematically showing an example of the optical laminate with a base layer of the present embodiment. In the drawing, W represents the width direction. As shown in FIG. 4, the optical laminated body 3a with a base layer of this embodiment has the laminated body 1a shown in FIG. 1, the adhesive layer 30a, and the optical functional layer 60a in this order. , The adhesive layer 30a is provided on the side of the first liquid crystal layer 13a of the laminate 1a. The optical laminated body 3a with a base layer should have a structure in which the first liquid crystal layer 13a of the laminated body 1a and the optical functional layer 60a face each other through the adhesive layer 30a, and the laminated body 1a ) And the optical functional layer 60a may be bonded to each other through the adhesive layer 30a, or an optical functional layer 60a may be provided on the adhesive layer 30a of the adhesive layer-equipped laminate 2a shown in FIG. . The description of the substrate layer 11a, the alignment layer 12a, the first liquid crystal layer 13a, and the adhesive layer 30a included in the optical laminate 3a with a substrate layer is as described in the previous embodiment. The optical functional layer 60a may include, for example, a polarizing layer, may include a second liquid crystal layer, which is a liquid crystal layer formed by polymerizing a polymerizable liquid crystal compound, or may include a polarizing layer and a second liquid crystal layer. . The substrate layer-equipped optical laminate 3a may be a single-leafed film or a long film.

As shown in FIG. 4, the optical functional layer 60a has a length in the width direction longer than that of the adhesive layer 30a in the cross-section in the width direction of the optical laminate 3a with the base layer, and the optical functional layer ( The positions of both ends in the width direction of 60a) are outside the positions of both ends in the width direction of the adhesive layer 30a in the width direction. The length in the width direction of the optical functional layer 60a and the positions of both ends in the width direction are not limited to those shown in FIG. 4, but in the above relationship, when transporting the optical laminate 3a with a base layer, the adhesive layer It is possible to suppress the protrusion and contamination of the conveying path. In addition, there is no particular limitation on the relationship between the length in the width direction and the positions of both ends in the width direction between the optical functional layer 60a and each layer of the laminate 1a, and the length in the width direction of the optical functional layer 60a is, It may be longer or shorter than all the layers constituting the laminate 1a, may be different from any layer constituting the laminate 1a, or may be the same as any one of the layers.

In addition, the positions of both ends of the optical functional layer 60a in the width direction may be outside or inside the width direction than all the layers constituting the laminate 1a, or may be the same as any one layer constituting the laminate 1a.

As described later, the optical laminate 4a (FIG. 6) can be obtained by peeling the substrate layer-containing layer 10a from the substrate layer-equipped optical laminate 3a. Since the optical laminated body 3a with a base layer contains a liquid crystal compound that is horizontally aligned and has a first liquid crystal layer 13a having a displacement amount of 2.0 mm or less in a piercing test, as described above, the base layer When peeling the base material layer-containing layer 10a from the provided optical laminate 3a, between the laminated region 13ay of the first liquid crystal layer 13a and the unlaminated region 13ax, the first liquid crystal layer 13a Can be separated well.

In addition, in the optical laminate 3a with the substrate layer, since the adhesion between the substrate layer-containing layer 10a and the first liquid crystal layer 13a is 0.05 N/25 mm or more, the laminated region of the first liquid crystal layer 13a Between (13ay) and the unlaminated region 13ax, the first liquid crystal layer 13a can be separated satisfactorily.

The optical laminated body with a base material layer of this embodiment may be changed like the modified example shown below.

(Modified Example 1 of Embodiment 3)

In the above, the laminate 1a shown in Fig. 1, the optical laminate 3a provided with the base layer having the adhesive layer 30a, and the optical functional layer 60a has been described as an example, but the laminate shown in Fig. 2 The laminated body 1b may be sufficient. The optical laminate 4b (FIG. 7) described later can be obtained by peeling the substrate layer 11b (substrate layer-containing layer) from the substrate layer-equipped optical laminate using the laminate 1b. In the optical laminate with a base layer using the laminate 1b, the displacement amount in the protrusion test of the first liquid crystal layer-containing layer 20b having the first liquid crystal layer 13b containing the horizontally aligned liquid crystal compound is 2.0 mm By the following, when peeling the base material layer 11b from the base material layer-equipped optical laminated body, the laminated area|region which is the area|region where an adhesive layer was laminated|stacked, and the area|region where an adhesive layer is not laminated|stacked, the aesthetic Between the layer regions, the first liquid crystal layer-containing layer 20b can be satisfactorily separated.

In addition, when the adhesion between the substrate layer 11b and the first liquid crystal layer-containing layer 20b is 0.05 N/25 mm or more, when peeling the substrate layer 11b from the optical laminate with the substrate layer, the laminated region and the unlaminated layer It becomes easy to separate the first liquid crystal layer-containing layer 20b satisfactorily between regions.

(Modification 2 of Embodiment 3)

The above has been described by taking the laminated body with an adhesive layer including an alignment layer as an example, but the optical laminated body with a base layer may not contain an alignment layer.

(Modification 3 of Embodiment 3)

In the above, the optical laminate 3a (Fig. 4) with a base layer using the optical functional layer 60a has been described as an example, but the optical functional layer 60a may be, for example, the laminate 1a shown in Fig. 1 . 5 is a schematic cross-sectional view schematically showing another example of the optical laminate with a base layer of the present embodiment. The optical laminated body 3c with a base layer shown in FIG. 5 includes the laminated body 1a, the adhesive layer 30c, and the optical functional layer 60c in this order. The description of the laminate 1a is the same as described in the previous embodiment.

In addition, since the adhesive layer 30d is the same as the adhesive layer 30a, and the optical functional layer 60c has the same layer structure as the laminated body 1a shown in FIG. 1, the description thereof is omitted.

In the optical laminated body 3c with a base material layer, the adhesive layer 30c is provided on the 1st liquid crystal layer 13a (2nd liquid crystal layer) side of the optical functional layer 60c. Further, the optical laminate can be obtained by peeling the substrate layer-containing layer 10a constituting the laminate 1a from the substrate layer-equipped optical laminate 3c.

In the optical laminated body 3c with a base layer, the case where the laminated body 1a shown in Fig. 1 is used as the optical functional layer 60c is described as an example, but the laminated body 1b shown in Fig. 2 is used as the optical functional layer. ) Can also be used. Further, the first liquid crystal layer or the liquid crystal layer-containing layer of the laminate constituting the optical functional layer may have a displacement amount of 2.0 mm or less in a protrusion test, or may exceed 2.0 mm.

[Embodiment 4 (optical laminate and manufacturing method thereof)]

6 is a schematic cross-sectional view schematically showing an example of the manufacturing process of the optical laminate of the present embodiment. In the drawing, W represents the width direction. As shown in FIG. 6, the optical laminated body 4a of this embodiment is the 1st' liquid crystal layer 13'a (the 1st' liquid crystal layer containing layer), the adhesive layer 30a, and the optical function layer 60a. Are included in this order. The first' liquid crystal layer 13'a includes a liquid crystal compound aligned in a horizontal direction with respect to the surface. The description of the adhesive layer 30a and the optical functional layer 60a included in the optical laminate 4a is the same as described in the previous embodiment. The optical laminated body 4a may be a sheet film or a long film.

In the cross section of the optical laminate 4a in the width direction, the first' liquid crystal layer 13'a and the adhesive layer 30 have the same length in the width direction as shown in Fig. 6, and the positions at both ends in the width direction You can do the same.

Such an optical laminated body 4a can be obtained through, for example, a step of peeling the base material layer-containing layer 10a from the base material layer-equipped optical laminate 3a shown in FIG. 4. When the base layer-containing layer 10a is peeled off from the base layer-equipped optical laminate 3a, as shown in Fig. 6, the unlaminated region 13ax exists on the base layer-containing layer 10a, and the stacked region 13ay The first liquid crystal layer 13a can be separated so that) is present on the adhesive layer 30a, so that the laminated region 13ay existing on the adhesive layer 30a becomes the first' liquid crystal layer 13'a. Separation of the first liquid crystal layer 13a is achieved in that the first liquid crystal layer 13a in the optical laminate 3a provided with the base layer is not provided with the adhesive layer 30a in the unlaminated region 13ax (Fig. 4). It is generated because it has a portion indicated by a diagonal line rising to the right side) and a laminated region 13ay in which the adhesive layer 30a is provided. Specifically, since the laminated region 13ay is a region in which the adhesive layer 30 is provided, even if the substrate layer-containing layer 10a is peeled off, it is fixed to the adhesive layer 30a and difficult to peel off together with the substrate layer-containing layer 10a. On the other hand, since the unlaminated region 13ax is a region in which the adhesive layer 30a is not provided, when the substrate layer-containing layer 10a is peeled, it is easily peeled off together with the substrate layer-containing layer 10a. As a result, when the substrate layer-containing layer 10a is peeled from the substrate layer-equipped optical laminate 3a, the first liquid crystal layer 13a is separated into an unlaminated region 13ax and a laminated region 13ay.

In the present embodiment, as described above, the first liquid crystal layer 13a in the optical laminate 3a with the base layer contains a horizontally aligned liquid crystal compound, and the displacement amount in the piercing test is 2.0 mm Below. Therefore, by peeling the substrate layer-containing layer 10a from the substrate layer-equipped optical laminate 3a, the unlaminated region 13ax and the laminated region 13ay can be satisfactorily separated, so that the laminated region 13ay and the aesthetics The first liquid crystal layer 13a is not separated at the intended position, such as between the layer regions 13ax, is not separated, the separation part becomes irregular, and the occurrence of problems such as wrinkles in the separation part is suppressed. can do. In addition, since the displacement amount in the protrusion test is within the above range, as shown in FIG. 6, the positions of both ends of the first' liquid crystal layer 13'a in the width direction and both ends of the adhesive layer 30 in the width direction It becomes easy to obtain the optical laminated body 4a having the same position.

In the first' liquid crystal layer 13'a of the optical laminate 4a, the displacement amount in the piercing test is 2.0 mm or less, and 1.5 mm or less, similar to the first liquid crystal layer 13a described in the previous embodiment. It is preferably 1.2 mm or less, 1.1 mm or less, and may be 0 (zero) mm or more, but is usually 0.1 mm or more, preferably 0.3 mm or more, and more preferably 0.5 mm or more. As described above, when obtaining the optical laminate 4a from the base layer-equipped optical laminate 3a, the first' liquid crystal layer 13'a is the first liquid crystal layer 13a described in the previous embodiment. Since it is a layer derived from, it can have the same characteristics as the first liquid crystal layer 13a.

In addition, the optical laminated body 4a can also be used as the optical functional layer demonstrated in the previous embodiment. The optical laminate with a base layer using the optical laminate 4a as an optical functional layer is provided with a liquid crystal layer-containing layer of the laminate and the first' liquid crystal layer 13'a of the optical laminate 4a through an adhesive layer. 2 liquid crystal layer) can be made into facing. Further, an optical laminate can be obtained by peeling the substrate layer-containing layer from the substrate layer-equipped optical laminate.

The optical layered product of this embodiment and its manufacturing method may be changed as in the modified example shown below.

(Modified Example 1 of Embodiment 4)

In the above, the optical laminate 4a including the first' liquid crystal layer 13'a, the adhesive layer 30a, and the optical functional layer 60a in this order has been described as an example, but the optical laminate is further aligned. It may have a layer, and for example, the optical laminated body shown in FIG. 7 may be sufficient. 7 is a schematic cross-sectional view schematically showing another example of the optical laminate of the present embodiment. As shown in Fig. 7, the optical laminate 4b includes a first' liquid crystal layer-containing layer 20'b and an adhesive layer including an alignment layer 12'b and a first' liquid crystal layer 13'b. (30a) and the optical functional layer 60a are included in this order. The adhesive layer 30a is provided on the first' liquid crystal layer 13'b side of the first' liquid crystal layer-containing layer 20'b.

In the cross section of the optical laminate 4b in the width direction, the first' liquid crystal layer containing layer 20'b (alignment layer 12'b and first' liquid crystal layer 13'b) and the adhesive layer 30a are , As shown in FIG. 7, the length in the width direction is the same, and the positions of both ends in the width direction can be the same. Such an optical laminate 4b can be obtained by peeling the substrate layer 11b (substrate layer-containing layer) from the optical laminate with a substrate layer including the laminate 1b (Fig. 2), for example. When the base layer 11b is peeled from the base layer-equipped optical laminate including the stacked body 1b, the same as in the case of obtaining the optical stacked body 4a from the base layer-equipped optical stack 3a shown in FIG. According to the principle, as shown in FIG. 7, the first liquid crystal layer-containing layer 20b (FIG. 2) is an unlaminated area (indicated by a diagonal line rising to the right in FIG. 7 ), which is an area in which the adhesive layer 30a is not laminated. Part) and a laminated region, which is a region in which the adhesive layer 30a is laminated. In the layered product 1b shown in FIG. 2, the displacement amount in the protrusion test of the first liquid crystal layer-containing layer 20b having the first liquid crystal layer 13b containing the horizontally aligned liquid crystal compound is 2.0 mm or less. Therefore, when the substrate layer 11b is peeled from the optical laminate with a substrate layer including the laminate 1b, the first liquid crystal layer-containing layer 20b can be properly separated from the unlaminated region and the laminated region. Accordingly, the above-described laminated region becomes the first' liquid crystal layer-containing layer 20'b shown in Fig. 7, and the positions of both ends of the first' liquid crystal layer-containing layer 20'b in the width direction are the adhesive layer 30a. The optical laminated body 4b identical to the positions of both ends in the width direction can be obtained.

In the 1st' liquid crystal layer-containing layer 20'b of the optical laminated body 4b, the displacement amount in a protrusion test is 2.0 mm or less like the 1st liquid crystal layer-containing layer 20b described in the previous embodiment, and 1.5 It is preferably mm or less, 1.2 mm or less, 1.1 mm or less, and may be 0 (zero) mm or more, but usually 0.1 mm or more, preferably 0.3 mm or more, and more preferably 0.5 mm or more. As described above, in the case of obtaining the optical laminate 4b from an optical laminate having a base layer including the laminate 1b, the first ′ liquid crystal layer-containing layer 20 ′b and the first ′ liquid crystal layer-containing layer 20 Since the alignment layer 12'b and the first' liquid crystal layer 13'b included in'b) become layers derived from the first liquid crystal layer-containing layer 20b described in the previous embodiment, the first The liquid crystal layer containing layer 20b, the alignment layer 12b, and the first liquid crystal layer 13b may each have the same characteristics.

In addition, the optical laminated body 4b can also be used as an optical functional layer described in the previous embodiment. In the optical laminate with a base layer using the optical laminate 4b as an optical functional layer, the liquid crystal layer-containing layer of the laminate and the alignment layer 12'b of the optical laminate 4b face each other through an adhesive layer. have. Further, an optical laminate can be obtained by peeling the substrate layer-containing layer from the substrate layer-equipped optical laminate.

(Modified Example 2 of Embodiment 4)

Above, the case of obtaining the optical laminate 4a (Fig. 6) by peeling the substrate layer-containing layer 10a from the substrate layer-equipped optical laminate 3a shown in Fig. 4 has been described. The base layer-containing layer 10a may be peeled from the base layer-equipped optical layered body 3c to obtain an optical layered body.

Further, the optical laminate obtained by peeling the substrate layer-containing layer 10a from the substrate layer-equipped optical laminate 3c shown in FIG. 5 can also be used as the laminate described in the previous embodiment. In this case, an optical laminate with a substrate layer can be obtained by providing an adhesive layer on the side from which the substrate layer-containing layer 10a was peeled off, and laminating an optical functional layer on the adhesive layer. An optical laminate can also be obtained by peeling the substrate layer-containing layer 10a from this substrate layer-equipped optical laminate. In this case, as described in the previous embodiment, the displacement amount of the first liquid crystal layer 13a included in the optical functional layer 60c in the protrusion test is preferably 2.0 mm or less, and the optical functional layer It is preferable that the adhesion between the substrate layer-containing layer 10a and the first liquid crystal layer 13a included in (60c) be 0.05 N/25 mm or more. Accordingly, by peeling off the base layer 11a included in the optical functional layer 60c, the first liquid crystal layer 13a included in the optical functional layer 60c can be satisfactorily separated into a laminated region and an unlaminated region. have.

In addition, the optical laminate obtained by peeling the substrate layer-containing layer 10a from the substrate layer-equipped optical laminate 3c shown in FIG. 5 can also be used as the optical functional layer described in the previous embodiment.

(Modified Example 3 of Embodiment 4)

In the above description, the case of manufacturing the optical laminate 4a by peeling the substrate layer-containing layer 10a from the substrate layer-containing optical laminate 3a at both ends in the width direction was described as an example. It is not limited to this. For example, when viewed from the top of the optical laminate with a substrate layer, when the first liquid crystal layer has an unlaminated region in the center of the first liquid crystal layer and has a laminated region to surround the unlaminated region, the first peeling layer from the optical laminate with the substrate layer By peeling, the first liquid crystal layer can be satisfactorily separated between the unlaminated region and the laminated region. In this case, in the optical laminate, the position of the contour of the first' liquid crystal layer and the position of the contour of the adhesive layer in plan view can be matched.

As described above, embodiments of the present invention and modifications thereof have been described, but the present invention is not limited to these embodiments and modifications thereof, for example, by combining the structures and steps of each of the embodiments and modifications thereof described above. You can also do it. Hereinafter, each item common to all embodiments and modifications thereof will be described in detail.

(Optical functional layer)

The optical functional layer is not particularly limited in its configuration, but a polarizing layer, a polarizing plate in which a protective layer is formed on at least one surface of the polarizing layer, a protective film provided with a protective film laminated on at least one surface of the polarizing plate, polarizing plate, reflective film, transflective type It may be a reflective film, a luminance enhancing film, an optical compensation film, a film with an anti-glare function, a retardation film, or the like, and may have one of them, or may have a multilayer structure having two or more. Moreover, the optical functional layer may contain a 2nd liquid crystal layer. In the present specification, the "polarization layer" refers to a layer having a property of transmitting linearly polarized light having a vibration surface orthogonal to an absorption axis when unpolarized light is incident.

As the polarizing layer that may be included in the optical function layer, a polyvinyl alcohol resin layer in which a dichroic dye is adsorbed and oriented on a single layer polyvinyl alcohol resin film may be used. A laminated film of more than one layer may be used. Further, the polarizing layer may be a cured film obtained by aligning a dichroic dye to a polymerizable liquid crystal compound and polymerizing the polymerizable liquid crystal compound. In this case, the polarizing layer may be a second liquid crystal layer.

The second liquid crystal layer, which may be included in the optical functional layer, may be formed by polymerization of a polymerizable liquid crystal compound. The second liquid crystal layer is dried by applying a composition for forming a liquid crystal layer containing a polymerizable liquid crystal compound on the base layer for the second liquid crystal layer or the alignment layer for the second liquid crystal layer provided thereon, and is then dried with active energy rays such as ultraviolet rays. It can be formed by polymerizing and curing a polymerizable liquid crystal compound by irradiation.

(Substrate layer)

The substrate layer is not particularly limited in its configuration, but is preferably a film formed of a resin material. As the resin material, for example, a resin material excellent in transparency, mechanical strength, thermal stability, and stretchability is used. Specifically, polyolefin resins such as polyethylene and polypropylene; Cyclic polyolefin resins such as norbornene-based polymers; Polyester resins such as polyethylene terephthalate and polyethylene naphthalate; (Meth)acrylic acid-based resins such as (meth)acrylic acid and poly(meth)methyl acrylate; Cellulose ester resins such as triacetyl cellulose, diacetyl cellulose, and cellulose acetate propionate; Vinyl alcohol-based resins such as polyvinyl alcohol and polyvinyl acetate; Polycarbonate-based resins; Polystyrene resin; Polyarylate resin; Polysulfone resin; Polyethersulfone-based resins; Polyamide resin; Polyimide resin; Polyether ketone resin; Polyphenylene sulfide resin; And polyphenylene oxide resins, mixtures thereof, and copolymers thereof. Among these resins, it is preferable to use any one of a cyclic polyolefin resin, a polyester resin, a cellulose ester resin, and a (meth)acrylic acid resin, or a mixture thereof. In addition, the said "(meth)acrylic acid" means "at least 1 type of acrylic acid and methacrylic acid."

The base material layer may be a single layer of one type or a mixture of two or more resins, or may have a multilayer structure of two or more layers. In the case of having a multilayer structure, the resins constituting each layer may be the same or different from each other. When the base layer is a film formed of a resin material, an optional additive may be added to the base layer. Examples of the additives include ultraviolet absorbers, antioxidants, lubricants, plasticizers, mold release agents, colorants, flame retardants, nucleating agents, antistatic agents, pigments and colorants.

The thickness of the substrate layer is not particularly limited, but in general, it is preferably 1 to 300 µm, more preferably 10 to 200 µm, and still more preferably 30 to 120 µm from the viewpoint of workability such as strength and handling. Do.

(Orientation layer)

The laminate may contain an alignment layer between the base layer and the first liquid crystal layer. The alignment layer has an alignment regulating force for aligning the polymerizable liquid crystal compound contained in the liquid crystal layer formed thereon in a desired direction. As the alignment layer, it is preferable to have solvent resistance that is not dissolved by application of a polymerizable liquid crystal composition or the like, and to have heat resistance in heat treatment for removal of the solvent or alignment of the polymerizable liquid crystal compound described later. Examples of the alignment layer include an alignment polymer layer formed of an alignment polymer, a photo-alignment polymer layer formed of a photo-alignment polymer, and a groove alignment layer having an uneven pattern or a plurality of grooves (grooves) on the surface of the layer. From the viewpoint of easiness of controlling the orientation regulating force, a photo-alignment polymer layer is preferred as the orientation layer. The thickness of the alignment layer is preferably 0.01 µm or more, 0.05 µm or more, and usually 10 µm or less, 3 µm or less, and 0.5 µm or less.

The oriented polymer layer can be formed by applying a composition in which the oriented polymer is dissolved in a solvent to the base layer to remove the solvent, and performing rubbing treatment as necessary. In this case, the orientation regulating force can be arbitrarily adjusted in the orientation polymer layer formed of the orientation polymer in accordance with the surface condition and rubbing conditions of the orientation polymer. Further, it is possible to adjust the film strength by adding a crosslinking agent or the like to the oriented polymer.

The photo-alignment polymer layer can be formed by applying a composition for forming a photo-alignment film containing a polymer having a photoreactive group or a monomer and a solvent on a base layer and irradiating with polarized light. In this case, in the photo-alignment polymer layer, the orientation regulating force can be arbitrarily adjusted according to conditions of polarization irradiation with respect to the photo-alignment polymer. Further, it is possible to adjust the film strength by adding a crosslinking agent or the like to the oriented polymer.

The photoreactive group refers to a group that produces liquid crystal alignment ability by irradiating light. Specifically, the group involved in the photoreaction which is the origin of the liquid crystal alignment ability, such as the orientation organic or isomerization reaction, dimerization reaction, photocrosslinking reaction, or photodecomposition reaction of molecules generated by light irradiation can be mentioned. Among them, the groups involved in the dimerization reaction or the photo-crosslinking reaction are preferable in terms of excellent orientation and film strength. As the photoreactive group, a group having an unsaturated bond, particularly a double bond, is preferred, and a carbon-carbon double bond (C=C bond), a carbon-nitrogen double bond (C=N bond), a nitrogen-nitrogen double bond (N= N bond) and a group having at least one selected from the group consisting of a carbon-oxygen double bond (C=O bond) is particularly preferred.

Examples of the photoreactive group having a C=C bond include a vinyl group, a polyene group, a stilbene group, a stilbazole group, a stilbazolium group, a chalcone group, and a cinnamoyl group.

Examples of the photoreactive group having a C=N bond include groups having structures such as an aromatic cipro base and an aromatic hydrazone. Examples of the photoreactive group having an N=N bond include an azobenzene group, an azonaphthalene group, an aromatic heterocyclic azo group, a bisazo group, a formazane group, and a group having an azoxybenzene structure. Examples of the photoreactive group having a C=O bond include a benzophenone group, a coumarin group, an anthraquinone group, and a maleimide group. These groups may have substituents such as an alkyl group, an alkoxy group, an aryl group, an allyloxy group, a cyano group, an alkoxycarbonyl group, a hydroxyl group, a sulfonic acid group, and a halogenated alkyl group.

Among them, a photoreactive group involved in the photo-dimerization reaction is preferred, and the amount of polarization irradiation required for photo-alignment is relatively small, and it is easy to obtain a photo-alignment film having excellent thermal stability and aging stability, so that the cinnamoyl group and the chalcone group desirable. As a polymer having a photoreactive group, it is particularly preferable to have a cinnamoyl group in which the terminal portion of the side chain of the polymer has a cinnamic acid structure.

A photo-alignment organic layer can be formed on the base layer by applying the composition for forming a photo-alignment film on the base layer. Examples of the solvent contained in this composition include solvents that can be used in the polymerizable liquid crystal composition as described later, and can be appropriately selected according to the solubility of the polymer or monomer having a photoreactive group.

The content of the polymer or monomer having a photoreactive group in the composition for forming a photo-alignment film can be appropriately adjusted according to the type of the polymer or monomer or the thickness of the desired photo-alignment polymer layer, but with respect to the mass of the composition for forming a photo-alignment film. , It is preferable to set it as at least 0.2 mass %, and the range of 0.3-10 mass% is more preferable. The composition for forming a photo-alignment film may contain a polymer material such as polyvinyl alcohol or polyimide, or a photosensitizer within a range that does not significantly impair the characteristics of the photo-alignment film.

As a method of applying the composition for forming a photo-alignment layer to the substrate layer, known methods such as spin coating, extrusion, gravure coating, die coating, bar coating, applicator coating, and flexographic printing. This is how it was done. As a method of removing the solvent from the applied composition for forming a photo-alignment film, for example, a natural drying method, a ventilation drying method, a heat drying method, and a vacuum drying method may be mentioned.

In order to irradiate polarized light, a type in which polarized UV is directly irradiated to the removal of the solvent from the composition for forming a photo-alignment film applied on the substrate layer, or a type in which polarized light is irradiated from the side of the substrate layer and the polarized light is transmitted to irradiate may be employed. In addition, this polarized light is particularly preferably substantially parallel light.

The wavelength of polarized light to be irradiated is preferably a wavelength range in which the photoreactive group of a polymer or monomer having a photoreactive group can absorb light energy. Specifically, UV (ultraviolet rays) in the wavelength range of 250 to 400 nm is particularly preferred. Examples of light sources used for polarized light irradiation include xenon lamps, high pressure mercury lamps, ultra high pressure mercury lamps, metal halide lamps, ultraviolet lasers such as KrF, ArF, and the like, and high pressure mercury lamps, ultra high pressure mercury lamps, and metal halide lamps are more desirable. Among these, high-pressure mercury lamps, ultra-high pressure mercury lamps, and metal halide lamps are preferable because of their high luminous intensity of ultraviolet rays having a wavelength of 313 nm. Polarized UV can be irradiated by irradiating light from the light source through a suitable polarizer. As such a polarizer, a polarizing filter, a polarizing prism such as Glen Thompson or Glen Taylor, or a wire grid type polarizer can be used.

The groove alignment layer is, for example, a method of forming an uneven pattern by performing exposure, development, etc. through an exposure mask having a pattern-shaped slit on the surface of a photosensitive polyimide film, a plate-shaped disk having a groove on the surface, and an active energy ray-curable resin A method of forming an uncured layer of the substrate, transferring the layer to the substrate layer to cure, forming an uncured layer of active energy ray-curable resin on the substrate layer, and pressing the uncured roll-shaped disc on this layer. It can be formed by a method of hardening by forming irregularities.

(First liquid crystal layer and second liquid crystal layer)

The first liquid crystal layer and the second liquid crystal layer (hereinafter, both are collectively referred to as "liquid crystal layer" in some cases) can be formed using a composition containing a liquid crystal compound such as a known polymerizable liquid crystal compound. .

The kind of the polymerizable liquid crystal compound is not particularly limited, and a rod-shaped liquid crystal compound, a disk-shaped liquid crystal compound, and a mixture thereof can be used. The polymerizable liquid crystal compound has a polymerizable reactor capable of participating in at least one polymerization reaction, particularly a photopolymerizable reactor. The photopolymerization reactor refers to a group capable of participating in the polymerization reaction by reactive active species generated from a photopolymerization initiator, such as an active radical or an acid. Examples of the photopolymerizable functional 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. . Among them, an acryloyloxy group, a methacryloyloxy group, a vinyloxy group, an oxiranyl group, and an oxetanyl group are preferable, and an acryloyloxy group is more preferable. The liquid crystallinity of the polymerizable liquid crystal compound may be a thermotropic liquid crystal or a lyotropic liquid crystal, and the image order structure may be a nematic liquid crystal or a smectic liquid crystal. As for the polymerizable liquid crystal compound, only 1 type may be used and 2 or more types may be combined and used for it.

As a polymerizable liquid crystal compound, for example, Japanese Patent Laid-Open No. 11-513019, Japanese Patent Laid-Open No. 2010-31223, Japanese Patent Laid-Open No. 2010-270108, Japanese Patent Laid-Open No. 2011-6360, and Japanese Patent Laid-Open 2011-207765 The liquid crystal compound etc. as described in the publication can be mentioned.

In the case of using a polymerizable liquid crystal compound, the composition containing the polymerizable liquid crystal compound further contains additives such as a solvent, a polymerization initiator, a crosslinking agent, a leveling agent, an antioxidant, a plasticizer, and a sensitizer, in addition to the polymerizable liquid crystal compound. You may have it. Each of these components may be used alone or in combination of two or more.

As the solvent which may be contained in the composition containing the polymerizable liquid crystal compound, a solvent capable of dissolving the polymerizable liquid crystal compound, and a solvent inert to the polymerization reaction of the polymerizable liquid crystal compound is preferable.

Examples of the solvent include alcohol solvents such as methanol, ethanol, ethylene glycol, isopropyl alcohol, propylene glycol, methyl cellosolve, butyl cellosolve, propylene glycol monomethyl ether, and phenol; Ester solvents such as ethyl acetate and butyl acetate; Ketone solvents such as acetone, methyl ethyl ketone, cyclopentanone, cyclohexanone, cycloheptanone, methyl amyl ketone, methyl isobutyl ketone, and N-methyl-2-pyrrolidinone; Non-chlorinated aliphatic hydrocarbon solvents such as pentane, hexane and heptane; Non-chlorinated aromatic hydrocarbon solvents such as toluene and xylene; Nitrile solvents such as acetonitrile; Ether solvents such as propylene glycol monomethyl ether, tetrahydrofuran, and dimethoxyethane; And chlorinated hydrocarbon solvents such as chloroform and chlorobenzene. Solvents may be used alone or in combination.

The content of the solvent in the polymerizable liquid crystal composition is usually preferably 10 parts by mass to 10,000 parts by mass, and more preferably 50 parts by mass to 5000 parts by mass per 100 parts by mass of the solid content. Here, the solid content means the sum of components other than the solvent in the polymerizable liquid crystal composition.

The polymerization initiator which may be contained in the composition containing the polymerizable liquid crystal compound is a compound capable of initiating a polymerization reaction of the polymerizable liquid crystal compound, and a photopolymerization initiator is preferred in that it can start the polymerization reaction under lower temperature conditions. . Specifically, photopolymerization initiators that can generate active radicals or acids by the action of light are mentioned, and among them, photopolymerization initiators that generate radicals by the action of light are preferred. Examples of the photo radical polymerization initiator include benzoin compounds, benzophenone compounds, benzyl ketal compounds, α-hydroxyketone compounds, α-aminoketone compounds, oxime compounds, triazine compounds, iodonium salts and sulfonium salts. As a photo radical polymerization initiator, only one type may be used, or two or more types may be used in combination.

A commercially available product may be used as the photo radical polymerization initiator. As such commercially available products, specifically Irgacure (registered trademark) 907, Irgacure 184, Irgacure 651, Irgacure 819, Irgacure 250, Irgacure 369, Irgacure 379 , Irgacure 127, Irgacure 2959, Irgacure 754, Irgacure 379EG (above, manufactured by BASF Japan Co., Ltd.), Sakeall BZ, Sakeall Z, Sakeall BEE (above, Seiko Chemical Co., Ltd.) Shiki Co., Ltd.), Kayacure BP100 (Nippongayaku Co., Ltd.), Kayacure UVI-6992 (Dau Co., Ltd.), Adeka Optoma SP-152, Adeka Optoma SP-170, Adeka Optoma N-1717, Adeka Optoma N-1919, Adeka Arcles NCI-831, Adeka Arcles NCI-930 (above, manufactured by ADEKA Co., Ltd.), TAZ-A, TAZ-PP (above, manufactured by Nippon Siberheg Screw) ) And TAZ-104 (manufactured by Sanwa Chemical).

The content of the polymerization initiator is usually 0.1 to 30 parts by mass, preferably 1 to 20 parts by mass, and more preferably 1 to 15 parts by mass based on 100 parts by weight of the total amount of the polymerizable liquid crystal compound. If it is within this range, the reaction of the polymerizable group proceeds sufficiently, and it is easy to stabilize the alignment state of the liquid crystal compound.

The crosslinking agent which may be contained in the composition containing the polymerizable liquid crystal compound is a compound having one or more photo-reactive groups in the molecule. By using a crosslinking agent, the crosslinking density of the liquid crystal layer is changed, and it becomes easy to adjust the film strength. As a crosslinking agent, a polyfunctional acrylate compound, an epoxy compound, an oxetane compound, a methylol compound, an isocyanate compound, etc. are mentioned.

Among them, a polyfunctional acrylate compound is preferable from the viewpoint of uniformity of the coated film and adjustment of the film strength. The crosslinking agent preferably has 2 or more and 8 or less reactive groups in the molecule, more preferably 2 or more and 6 or less polymerizable groups.

As the polyfunctional acrylate, a commercially available product may be used. As such a commercial product, specifically, A-DOD-N, A-HD-N, A-NOD-N, APG-100, APG-200, APG-400, A-GLY-9E, A-GLY- 20E, A-TMM-3, A-TMPT, AD-TMP, ATM-35E, A-TMMT, A-9550, A-DPH, HD-N, NOD-N, NPG, TMPT (Shinnakamura Kagaku Kabu Manufactured by Shiki Corporation), "ARONIX M-220", East "M-325", East "M-240", East "M-270", "M-309", "M-310", East "M-321 ", "M-350", "M-360", "M-305", "M-306", "M-450", "M-451", "M-408" , East "M-400", East "M-402", East "M-403", East "M-404", East "M-405", East "M-406" (manufactured by Toagosei Co., Ltd. ),"EBECRYL11", East "145", East "150", East "40", East "140", East "180", DPGDA, HDDA, TPGDA, HPNDA, PETIA, PETRA, TMPTA, TMPEOTA, DPHA, EBECRYL Series (manufactured by Daicel Saitech Co., Ltd.), and the like.

The content of the crosslinking agent is preferably 1 to 30 parts by mass, and more preferably 3 to 20 parts by mass based on 100 parts by mass of the total amount of the polymerizable liquid crystal compound. If the content of the crosslinking agent is less than or equal to the lower limit, problems are likely to occur during processing such as polishing, and if it is more than the upper limit, the alignment state of the liquid crystal compound becomes unstable, and alignment defects are likely to occur.

As the reactive additive which may be contained in the composition containing the polymerizable liquid crystal compound, it is preferable to have a group having a carbon-carbon unsaturated bond and an active hydrogen-reactive group in the molecule. In addition, the term "active hydrogen-reactive group" herein refers to a group having reactivity with a group having an active hydrogen such as a carboxyl group (-COOH), a hydroxyl group (-OH), and an amino group (-NH ₂ ), and a glycidyl group, Representative examples include an oxazoline group, carbodiimide group, aziridine group, imide group, isocyanate group, thioisocyanate group, maleic anhydride group, and the like. The number of carbon-carbon unsaturated bonds and active hydrogen-reactive groups in the molecule of the reactive additive is usually 1 to 20, and preferably 1 to 10, respectively.

In the reactive additive, it is preferred that at least two active hydrogen reactive groups are present in the molecule. In this case, a plurality of active hydrogen-reactive groups may be the same or different.

The carbon-carbon unsaturated bond that the reactive additive has in the molecule refers to a carbon-carbon double bond or a carbon-carbon triple bond, and is preferably a carbon-carbon double bond. Among them, as a reactive additive, it is preferable to contain a carbon-carbon unsaturated bond in the molecule as a vinyl group and/or a (meth)acryl group. Further, it is preferable that the active hydrogen-reactive group is at least one selected from the group consisting of an epoxy group, a glycidyl group and an isocyanate group. In particular, a reactive additive having an acrylic group as a carbon-carbon double bond and an isocyanate group as an active hydrogen-reactive group is particularly preferable.

Examples of the reactive additive include compounds having a (meth)acryl group and an epoxy group, such as methacryloxyglycidyl ether and acryloxyglydiriether; Compounds having an (meth)acrylic group and an oxetane group, such as oxetane acrylate and oxetane methacrylate; Compounds having a (meth)acryl group and a lactone group, such as lactone acrylate and lactone methacrylate; Compounds having a vinyl group and an oxazoline group, such as vinyl oxazoline and isopropenyl oxazoline; Compounds having (meth)acrylic groups and isocyanate groups, such as isocyanatomethyl acrylate, isocyanatomethyl methacrylate, 2-isocyanatoethyl acrylate and 20 isocyanatoethyl methacrylate, and oligomers of these monomers, etc. Can be mentioned. Further, compounds having a vinyl group, a vinylene group and an acid anhydride, such as methacrylic acid anhydride, acrylic acid anhydride, maleic anhydride, and vinyl maleic anhydride, may be mentioned. Among them, methacryloxyglycidyl ether, acryloxyglycidyl ether, isocyanatomethyl acrylate, isocyanatomethyl methacrylate, vinyloxazoline, 2-isocyanatoethyl acrylate, 2-isocyanatoethylmeth Oligomers of acrylates or these monomers are preferred, and isocyanatomethylacrylate, 2-isocyanatoethylacrylate or oligomers of these monomers are particularly preferred.

When the polymerizable liquid crystal composition contains a reactive additive, the content is usually 0.1 parts by mass or more and 30 parts by mass or less, and preferably 0.1 parts by mass or more and 5 parts by mass or less based on 100 parts by mass of the polymerizable liquid crystal compound.

The composition containing the polymerizable liquid crystal compound may contain a leveling agent in order to make the coating film obtained by applying the composition more flat. Examples of the leveling agent include silicone-based, polyacrylate-based, and perfluoroalkyl-based leveling agents.

Commercially available products may be used as a leveling agent, specifically DC3PA, SH7PA, DC11PA, SH28PA, SH29PA, SH30PA, ST80PA, ST86PA, SH8400, SH8700, FZ2123 (above, all manufactured by Toray Dow Corning Co., Ltd.), KP321, KP323, KP324, KP326, KP340, KP341, X22-161A, KF6001 (above, all manufactured by Shin-Etsu Chemical Co., Ltd.), TSF400, TSF401, TSF410, TSF4300, TSF4440, TSF4445, TSF-4446, TSF4452, TSF4460 (above) , All made by Momentive Performance Materials Japan Kodoga), fluorinert (registered trademark) FC-72, copper FC-40, copper FC-43, copper FC-3283 (above, all Sumitomo 3M Co., Ltd.) Manufacturing), MegaPak (registered trademark) R-08, East R-30, East R-90, East F-410, East F-411, East F-443, East F-445, East F-470, East F -477, F-479, F-482, F-483, F-556 (above, all manufactured by DIC Corporation), Ftop (brand name) EF301, EF303, EF351, EF352 (above) , All of them manufactured by Misubishima Terial Denshi Kasei Co., Ltd.), Saffron (registered trademark) S-381, S-382, S-383, S-393, SC-101, SC-105, KH-40, SA-100 (above, all manufactured by AGC Semichemical Co., Ltd.), brand name E1830, copper E5844 (manufactured by Daikin Fine Chemical Genkyusho Co., Ltd.), BM-1000, BM-1100, BYK-352 , BYK-353 and BYK-361N (all are brand names: manufactured by BM Chemie), and the like. Leveling agents may be used alone or in combination of two or more.

The content of the leveling agent is preferably 0.01 to 5 parts by mass, more preferably 0.05 to 3 parts by mass per 100 parts by mass of the polymerizable liquid crystal compound. When the content of the leveling agent is within the above range, it is easy to align the polymerizable liquid crystal compound, and the resulting liquid crystal cured film tends to become smoother, which is preferable.

In the case of using a polymerizable liquid crystal compound, a composition containing a polymerizable liquid crystal compound is applied on the alignment layer and heated at a phase transition temperature to form a coating film in which the liquid crystal compound is horizontally aligned, and the coating film is cured to cure the liquid crystal. A liquid crystal layer as a layer can be formed. Alternatively, a liquid crystal layer may be formed by applying a composition containing a polymerizable liquid crystal compound on the substrate layer to form a coating film, and stretching the coating film together with the substrate layer.

As a method of applying a composition containing a polymerizable liquid crystal compound onto a substrate layer or an alignment layer, a spin coating method, an extrusion method, a gravure coating method, a die coating method, a bar coating method, an application method such as an applicator method, and a flexo method Known methods, such as a printing method, etc. are mentioned.

As a drying method of the composition containing a polymerizable liquid crystal compound, a natural drying method, a ventilation drying method, a heat drying, a vacuum drying method, etc. are mentioned. At this time, by heating the coating film obtained from the polymerizable liquid crystal composition, the solvent is dried and removed from the coating film, and the polymerizable liquid crystal compound can be aligned. The heating temperature of the coating film can be appropriately determined in consideration of the polymerizable liquid crystal compound to be used and the material of the substrate layer and alignment layer forming the coating film. However, in order to phase transition the polymerizable liquid crystal compound to a liquid crystal phase state, it is usually liquid crystal phase transition. It needs to be above the temperature.

The heating time can be appropriately determined depending on the heating temperature, the type of the polymerizable liquid crystal compound to be used, the type of the solvent, its boiling point, and the amount thereof, but is usually 15 seconds to 10 minutes, preferably 0.5 to 5 minutes.

In the obtained dry coating film, by curing the polymerizable liquid crystal compound while maintaining the orientation state of the polymerizable liquid crystal compound, a liquid crystal layer that is a polymer of the polymerizable liquid crystal compound present in a desired orientation state is formed. Examples of the curing method include thermal polymerization and photopolymerization, and photopolymerization is preferable from the viewpoint of easiness of polymerization. In photopolymerization, as the light irradiated to the dry coating film, the type of the photoradical polymerization initiator contained in the dry coating film, the type of the polymerizable liquid crystal compound (especially the type of the polymerizable group contained in the polymerizable liquid crystal compound) and the amount thereof Therefore, it is appropriately selected. Specific examples thereof include one or more types of light or active electron beams selected from the group consisting of visible light, ultraviolet light, infrared light, X-ray, α-ray, β-ray, and γ-ray. Among them, ultraviolet light is preferable because it is easy to adjust the film strength by controlling the progress of the polymerization reaction, and that one widely used in the field can be used as a photopolymerization device, and photopolymerization is possible with ultraviolet light. In this way, it is preferable to select the kind of the polymerizable liquid crystal compound or photoradical polymerization initiator contained in the polymerizable liquid crystal composition. Further, at the time of polymerization, the polymerization temperature can also be controlled by irradiating light while cooling the dried coating film by an appropriate cooling means. When the polymerization of the polymerizable liquid crystal compound is carried out at a lower temperature by employing such a cooling means, a liquid crystal layer can be appropriately formed even if a substrate having relatively low heat resistance is used. In addition, it is also possible to accelerate the polymerization reaction by increasing the polymerization temperature within a range that does not cause problems due to heat during light irradiation (such as deformation due to heat of the substrate).

Examples of light sources for light irradiated onto the dry coating include low pressure mercury lamps, medium pressure mercury lamps, high pressure mercury lamps, ultra high pressure mercury lamps, xenon lamps, halogen lamps, carbon arc lamps, tungsten lamps, gallium lamps, excimer lasers, wavelength range 380 to LED light sources emitting 440 nm, chemical lamps, black light lamps, microwave excitation mercury lamps, metal halide lamps, and the like.

The irradiation intensity of ultraviolet light is usually 10 to 3,000 mW/cm 2. The irradiation intensity of ultraviolet light is preferably an intensity in a wavelength region effective for activation of the photopolymerization initiator. The time to irradiate ultraviolet light is usually 0.1 seconds to 10 minutes, preferably 0.1 seconds to 5 minutes, more preferably 0.1 seconds to 3 minutes, and still more preferably 0.1 seconds to 1 minute. When irradiated once or several times with such an irradiation intensity of ultraviolet light, the accumulated light amount is 10 to 3,000 mJ/cm 2, preferably 50 to 2,000 mJ/cm 2, more preferably 100 to 1,000 mJ/cm 2.

The thickness of the liquid crystal layer can be appropriately selected depending on the display device to be applied, preferably 0.3 µm or more, 0.5 µm or more, 1 µm or more, and usually 10 µm or less, 5 µm or less, It is preferably 3 μm or less.

Each of the first liquid crystal layer and the second liquid crystal layer may be a retardation layer or a polarizing layer. The retardation layer is not particularly limited as long as it imparts a predetermined retardation to light, and examples thereof include a 1/2 wave plate, a 1/4 wave plate, and a 1/4 wave plate having reverse wavelength dispersion.

(Adhesive layer)

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

As the adhesive, it can be formed by combining one or two or more of water-based adhesives, active energy ray-curable adhesives, and the like. Examples of the water-based adhesive include a polyvinyl alcohol-based resin aqueous solution and an aqueous two-component urethane emulsion adhesive. As an active energy ray-curable adhesive, it is an adhesive that cures by irradiating an active energy ray such as ultraviolet rays, and includes, for example, a polymerizable compound and a photopolymerization initiator, a photoreactive resin, a binder resin and a photoreactive crosslinking agent. And things to do. Examples of the polymerizable compound include photopolymerizable monomers such as photocurable epoxy monomers, photocurable acrylic monomers, and photocurable urethane monomers, and oligomers derived from these monomers. Examples of the photopolymerization initiator include those containing substances that generate active species such as neutral radicals, anionic radicals, cationic radicals, and acids by irradiation with active energy rays such as ultraviolet rays. The thickness of the adhesive layer (adhesive layer) formed using the adhesive is not particularly limited, but is usually 0.001 µm to 10 µm, and from the viewpoint of poor appearance, 0.01 to 5 µm is preferable.

As the pressure-sensitive adhesive, for example, a (meth)acrylic resin, styrene resin, silicone resin, polyester, polyurethane, rubber resin or polyether is used as a base polymer, and a crosslinking agent such as an isocyanate compound, an epoxy compound, or an aziridine compound is added. Can be mentioned. Among them, a pressure-sensitive adhesive containing a (meth)acrylic resin is preferable because it is excellent in optical transparency, adhesiveness, and durability. The thickness of the adhesive layer (adhesive layer) formed by using the pressure-sensitive adhesive is not particularly limited, but is usually 1 µm to 40 µm, and 3 µm to 25 µm is preferable from the viewpoint of workability and durability.

The adhesive layer is preferably formed using an active energy ray-curable adhesive from the viewpoint of thinning or the like, and particularly preferably formed using an adhesive containing an ultraviolet curable epoxy monomer and a photocationic polymerization initiator.

(Optical laminate)

As the optical laminate, for example, one containing a polarizing layer is used as an optical functional layer, and a 1/4 wavelength plate is used as the first liquid crystal layer or the second liquid crystal layer, or 1/4 wavelength is used as the optical functional layer. It can be set as a circular polarizing plate by using what contains a plate and using a polarizing layer containing a liquid crystal compound as a 1st liquid crystal layer. Such a circularly polarizing plate can be used, for example, as an anti-reflection film for an organic elictroluminescence (EL) display device. In the case of using the optical laminate as a circular polarizing plate, the optical laminate should just include a polarizing layer and a 1/4 wavelength plate. For example, [i] a polarizing layer, a 1/2 wave plate, and a 1/4 wave plate, in order, Or [ii] may have a structure in which each layer is stacked in the order of a polarizing layer and a quarter wave plate having reverse wavelength dispersion.

[Example]

Hereinafter, the present invention will be more specifically described by showing examples and comparative examples, but the present invention is not limited by these examples. "%" and "parts" in Examples and Comparative Examples are mass% and mass parts unless otherwise specified.

[Measurement of in-plane phase difference]

The first liquid crystal layer-containing layer of the laminate was bonded to glass through an adhesive (pressure-sensitive adhesive 25 µm manufactured by Lintech Co., Ltd.), and the base layer-containing layer was peeled to obtain a test piece for measuring a phase difference value. The in-plane retardation value of the first liquid crystal layer-containing layer with respect to light having a wavelength of 550 nm was measured using KOBRA-WR manufactured by Oji-Isokugiki Co., Ltd.

[Measurement of displacement in penetrating test]

A fragment having a length of 30 mm x a width of 30 mm was cut out from the first liquid crystal layer-containing layer obtained by peeling the base material layer-containing layer from the laminate to obtain a test piece for a protrusion test. For the piercing test, the diameter that the piercing jig can pass through is performed using a small tabletop tester (trade name "EZTest" manufactured by Shimadzu Corporation) equipped with a piercing jig with a diameter of 1 mm and a radius of curvature of 0.5 R at the tip. The piercing jig was punctured at 0.33 cm/sec into the test piece for a piercing test sandwiched between two sample stands with a circular hole of 10 mm, and the amount of displacement until the test piece for piercing test was broken was measured.

[Measurement of adhesion]

On the side of the first liquid crystal layer-containing layer of the laminate obtained in Examples, a pressure-sensitive adhesive (pressure-sensitive pressure-sensitive adhesive made by Lintech, 25 μm) was bonded. A test piece having a width of 25 mm x a length of about 150 mm is cut from the laminate in which the pressure-sensitive adhesive layer was formed, and the side of the pressure-sensitive adhesive layer was bonded to a glass plate, and then peeled on the base layer-containing layer (one side of 25 mm in width) of the test piece. A dragon tape (25 mm wide x 180 mm long) was adhered. One end of the peeling tape was held using a tensile tester, and a 180° peeling test was conducted at a crosshead speed (grab movement speed) of 300 mm/min in an atmosphere of a temperature of 23°C and a relative humidity of 60% to measure adhesion.

[Evaluation of optical laminate]

A pressure-sensitive adhesive layer was formed on the side of the first liquid crystal layer of the laminate obtained in Examples (200 mm wide x 250 mm long, and the orientation direction of the first liquid crystal layer can take any direction with respect to the width direction). A pressure-sensitive adhesive (pressure-sensitive pressure-sensitive adhesive, 25 µm, manufactured by Lintech Co., Ltd.) was bonded to each of the unlaminated regions having a width of 50 mm at both ends in the width direction. On this pressure-sensitive adhesive layer, a polarizing plate (100 mm in width x about 250 mm in length) as an optical functional layer was laminated to obtain an optical laminate with a base layer. Regarding the optical laminate obtained by peeling the substrate layer-containing layer from the obtained optical laminate with the substrate layer along the long side direction, the shape of the end of the first liquid crystal layer was visually observed, and the shape of the adhesive layer was taken as A. , Amorphous shape that does not partially follow the shape of the adhesive layer or wrinkles were set as B, and C was defined as an irregular shape that does not follow the shape of the adhesive layer or wrinkles over the entire length of the end portion.

[Evaluation of processability]

The laminate obtained in the example (width 200 mm x length about 250 mm, the orientation direction of the first liquid crystal layer can take any direction with respect to the width direction), the base layer-containing layer above, and a super cutter (og. Noseiki Seisakusho) was used to cut the long side direction, and the vicinity of the cut portion on the first liquid crystal layer side of the test piece was observed with a microscope having a magnification of 100 times. If only minor cracks and wounds (length less than 0.5 mm) partially enter the first liquid crystal layer, A, and those with a length exceeding 0.5 µm and less than 1.0 mm, are referred to as B, cracks and wounds. What entered over the entire length of the first liquid crystal layer was set to C.

[Example 1]

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

The mixture obtained by mixing the following components was stirred at a temperature of 80° C. for 1 hour to obtain a composition for forming a photo-alignment layer (1).

Photo-alignment material (5 parts):

Solvent (95 parts): Cyclopentanone

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

With respect to 100 parts by mass of the polymerizable liquid crystal compound LC242 (manufactured by BASF) shown below, 0.1 parts by mass of the leveling agent "BYK-361N" (manufactured by BMChemie), 2-methyl-1-(4-methylthiophenyl) as a photopolymerization initiator )-2-morpholinopropan-1-one "Irgacure (registered trademark) 907 (Irg907)" (manufactured by BASF Japan) 3.0 parts by mass, Laromer (registered trademark) LR-9000 (BASF) as a reactive additive Japan Corporation) was added 2.0 parts by mass and 5.0 parts by mass of dipentaerythritol hexaacrylate "NK ester A-DPH" (manufactured by Shinnakamura Chemical Industry Co., Ltd.) as a crosslinking agent were added. Further, cyclopentanone was added so that the solid content concentration was 13%. The obtained mixture was stirred at 80° C. for 1 hour, and then cooled to room temperature to obtain a liquid crystal layer-forming composition (A).

(Production of laminate)

A polyethylene terephthalate (PET) film having a thickness of 100 µm as a base layer was treated with a corona treatment energy of 2.6 mJ/cm 2 using a corona treatment apparatus (AGF-B10, manufactured by Kasuga Denki Co., Ltd.). On the surface subjected to the corona treatment, the above-described composition for forming a photo-alignment layer (1) was applied with a bar coater, dried at 80° C. for 1 minute, and a polarized UV irradiation device (SPOT CURE SP-7; manufactured by Ushio Denki Co., Ltd.) ) Was used to perform polarized UV exposure with a cumulative amount of light of 100 mJ/cm 2 to obtain a photo-alignment layer. Further, polarized UV was irradiated so that the orientation direction of the photo-alignment layer after exposure was 45°.

Then, the composition for forming a liquid crystal layer (A) on the photo-alignment layer was applied using a bar coater, dried at 120° C. for 1 minute, and then a high-pressure mercury lamp (Unicure VB-15201BY-A, manufactured by Ushio Electric Corporation) ) Was used to irradiate ultraviolet rays (under a nitrogen atmosphere, wavelength: 365 nm, accumulated light amount at a wavelength of 365 nm: 1000 mJ/cm 2) to form a first liquid crystal layer as a retardation layer to obtain a laminate. The thickness of the obtained photo-alignment layer was measured with a laser microscope (LEXT, manufactured by Olympus Corporation) and found to be 100 nm. The thickness of the first liquid crystal layer measured by the same measurement method was 2 µm. When the in-plane retardation value of the obtained first liquid crystal layer-containing layer was measured by the method described above, it was Re(550)=258 nm.

When the substrate layer was peeled from the obtained laminate, the first liquid crystal layer-containing layer (the first liquid crystal layer provided with the photo-alignment layer) was isolated. Here, that only the 1st liquid crystal layer provided with the photo-alignment layer was isolated by the thickness measurement by the above-mentioned laser microscope. It was 1.0 mm when the amount of protrusion displacement of the obtained 1st liquid crystal layer-containing layer was measured by the above-described procedure. In addition, the adhesion between the substrate layer and the first liquid crystal layer-containing layer (the first liquid crystal layer with a photo-alignment layer) was 0.07 N/25 mm. Further, when the optical laminate was evaluated by the method described above, in the shape of the end of the first liquid crystal layer, no irregularities or wrinkles were observed, and the result was favorable. Moreover, when the workability evaluation was performed by the above-described method, cracks and wounds of 1.0 mm or less were partially contained. Table 1 shows these results.

[Example 2]

As shown in Table 1, except not adding a reactive additive, the same operation as in Example 1 was performed to prepare a polymerizable liquid crystal composition, and using this, a laminate was produced in the same procedure as in Example 1.

When the substrate layer was peeled from the obtained laminate, only the first liquid crystal layer was isolated from the substrate layer-containing layer (substrate layer with an optical alignment layer). Here, that only the first liquid crystal layer was isolated was confirmed by thickness measurement with the laser microscope described above. The amount of protrusion displacement was measured in the same manner as in Example 1, and the adhesion between the substrate layer-containing layer and the first liquid crystal layer was measured, peeling evaluation of the optical laminate, and workability were evaluated. Table 1 shows the results.

[Example 3]

As shown in Table 1, the same operation as in Example 1 was performed except that 15 parts of A-DPH was added to the polymerizable liquid crystal compound as a crosslinking agent and no reactive additive was added to prepare the polymerizable liquid crystal composition. Using this, a laminate was produced in the same procedure as in Example 1.

When the substrate layer was peeled from the obtained laminate, only the first liquid crystal layer was isolated from the substrate layer-containing layer (substrate layer with an optical alignment layer). Here, that only the first liquid crystal layer was isolated was confirmed by thickness measurement with the laser microscope described above. The amount of protrusion displacement was measured in the same manner as in Example 1, and the adhesion between the substrate layer-containing layer and the first liquid crystal layer was measured, peeling evaluation of the optical laminate, and workability were evaluated. Table 1 shows the results.

[Example 4]

As shown in Table 1, 15 parts of trimethylolpropane triacrylate (NK ester A-TMPT (manufactured by Shinnakamura Chemical Industry Co., Ltd.)) was added to the polymerizable liquid crystal compound as a crosslinking agent, and no reactive additive was added. Except that, the same operation as in Example 1 was performed, the polymerizable liquid crystal composition was adjusted, and a laminate was produced in the same procedure as in Example 1 using this.

When the substrate layer was peeled from the obtained laminate, only the first liquid crystal layer was isolated from the substrate layer-containing layer (substrate layer with an optical alignment layer). Here, that only the first liquid crystal layer was isolated was confirmed by thickness measurement with the laser microscope described above. The amount of protrusion displacement was measured in the same manner as in Example 1, and the adhesion between the substrate layer-containing layer and the first liquid crystal layer was measured, peeling evaluation of the optical laminate, and workability were evaluated. Table 1 shows the results.

[Example 5]

As shown in Table 1, Example 1 except that 15 parts of urethane acrylate (UA-122P (manufactured by Shinnakamura Chemical Industry Co., Ltd.)) was added to the polymerizable liquid crystal compound as a crosslinking agent, and no reactive additive was added. The same operation as that was performed to prepare a polymerizable liquid crystal composition, and using this, a laminate was produced in the same procedure as in Example 1.

When the substrate layer was peeled from the obtained laminate, only the first liquid crystal layer was isolated from the substrate layer-containing layer (substrate layer with an optical alignment layer). Here, that only the first liquid crystal layer was isolated was confirmed by thickness measurement with the laser microscope described above. The amount of protrusion displacement was measured in the same manner as in Example 1, and the adhesion between the substrate layer-containing layer and the first liquid crystal layer was measured, peeling evaluation of the optical laminate, and workability were evaluated. Table 1 shows the results.

[Example 6]

As shown in Table 1, 15 parts of 1,6-hexanediol diacrylate (NK ester A-HD-N (manufactured by Shinnakamura Chemical Industry Co., Ltd.)) was added to the polymerizable liquid crystal compound as a crosslinking agent, and reactivity Except having not added an additive, the same operation as Example 1 was performed, the polymerizable liquid crystal composition was adjusted, and using this, a laminated body was produced in the same procedure as Example 1.

When the substrate layer was peeled from the obtained laminate, only the first liquid crystal layer was isolated from the substrate layer-containing layer (substrate layer with an optical alignment layer). Here, that only the first liquid crystal layer was isolated was confirmed by thickness measurement with the laser microscope described above. The amount of protrusion displacement was measured in the same manner as in Example 1, and the adhesion between the substrate layer-containing layer and the first liquid crystal layer was measured, peeling evaluation of the optical laminate, and workability were evaluated. Table 1 shows the results.

[Description of codes]

1a, 1b: laminate, 2a: laminate with adhesive layer, 3a, 3c: optical laminate with substrate layer, 4a, 4b: optical laminate, 10a: substrate layer-containing layer, 11a: substrate layer, 11b: substrate layer (substrate Layer containing layer), 12a, 12b: alignment layer, 13a: first liquid crystal layer (first liquid crystal layer containing layer), 13'a: first' liquid crystal layer (first' liquid crystal layer containing layer), 13ax: unlaminated region, 13ay : Laminated region, 13b: first liquid crystal layer, 20b: first liquid crystal layer containing layer, 20'b: first' liquid crystal layer containing layer, 30a, 30c: adhesive layer, 60a, 60c: optical functional layer, W: width direction.

Claims (13)

As a laminate in which a first liquid crystal layer-containing layer including a first liquid crystal layer is provided on a base layer-containing layer including a base layer,
The base material layer-containing layer can be peeled off from the first liquid crystal layer-containing layer,
The first liquid crystal layer includes a liquid crystal compound aligned in a horizontal direction with respect to the surface of the first liquid crystal layer,
The amount of displacement in the protrusion test of the first liquid crystal layer-containing layer is 2.0 mm or less. The laminate according to claim 1, wherein an adhesion force between the base layer-containing layer and the first liquid crystal layer-containing layer is 0.05 N/25 mm or more. The method of claim 1 or 2, wherein the base layer-containing layer further comprises an alignment layer,
The first liquid crystal layer-containing layer is provided on the side of the alignment layer of the base layer-containing layer. The method according to claim 1 or 2, wherein the first liquid crystal layer-containing layer further comprises an alignment layer,
The base material layer-containing layer is a laminate provided on the side of the alignment layer of the first liquid crystal layer-containing layer. A laminate with an adhesive layer comprising the laminate according to any one of claims 1 to 4 and an adhesive layer,
The adhesive layer is laminated on the side of the first liquid crystal layer-containing layer of the laminate,
The first liquid crystal layer-containing layer has an adhesive layer-equipped laminate having an unlaminated region in which the adhesive layer is not laminated. The laminate with an adhesive layer according to claim 5, wherein the unlaminated region is present at at least one end of the laminate with an adhesive layer in the width direction. An optical laminate with a substrate layer comprising the laminate according to any one of claims 1 to 4, an adhesive layer, and an optical functional layer in this order,
The adhesive layer is an optical laminate with a base layer provided on the side of the first liquid crystal layer-containing layer of the laminate. An optical laminate with a base layer, wherein an optical functional layer is provided on the adhesive layer of the laminate with an adhesive layer according to claim 5 or 6. The optical laminate with a base layer according to claim 7 or 8, wherein the optical functional layer comprises a polarizing layer. The optical laminated body with a base layer according to any one of claims 7 to 9, wherein the optical functional layer includes a second liquid crystal layer. An optical laminate comprising a first' liquid crystal layer-containing layer including a first' liquid crystal layer, an adhesive layer, and an optical functional layer in this order,
The first' liquid crystal layer includes a liquid crystal compound aligned in a horizontal direction with respect to the surface of the first' liquid crystal layer,
An optical laminate having a displacement amount of the first' liquid crystal layer-containing layer in a protrusion test of 2.0 mm or less. The method of claim 11, wherein the first' liquid crystal layer-containing layer further includes an alignment layer,
The alignment layer is an optical laminate provided on the side opposite to the adhesive layer of the first' liquid crystal layer. As a manufacturing method of an optical laminate comprising a first' liquid crystal layer-containing layer including a first' liquid crystal layer, an adhesive layer, and an optical functional layer in this order,
A method for producing an optical laminate comprising a step of peeling the substrate layer-containing layer from the substrate layer-equipped optical laminate according to any one of claims 7 to 10.

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