JP6727390B1 - Laminate, laminate with adhesive layer, optical laminate with substrate layer, optical laminate, and method for producing the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a laminated body, a laminated body with an adhesive layer, and a base suitable for producing an optical laminated body having a liquid crystal layer in which generation of wrinkles and irregular foreign matters is suppressed at the time of transferring a liquid crystal layer to an optical functional layer. An optical layered body with a material layer, an optical layered body, and a method for manufacturing the same are provided. In the laminate, a first liquid crystal layer-containing layer including a first liquid crystal layer is provided on a base material layer-containing layer including a base material layer. The base material layer-containing layer is peelable from the first liquid crystal layer-containing layer. The first liquid crystal layer includes a liquid crystal compound that is aligned in the horizontal direction with respect to the surface of the first liquid crystal layer. The displacement amount of the first liquid crystal layer-containing layer in the puncture test is 2.0 mm or less. [Selection diagram] Figure 1

Description

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, an elliptically polarizing plate in which a linear polarizing plate and a retardation plate are laminated may be used to prevent reflection of external light. As a retardation plate constituting this elliptically polarizing plate, a retardation plate composed of a layer (liquid crystal layer) obtained by curing a polymerizable liquid crystal compound or a laminate thereof is known. In Patent Document 1, a liquid crystal layer horizontally aligned with respect to the surface of the base material is formed on a base material, and the liquid crystal layer is laminated on the linear polarization plate by a transfer method in which the liquid crystal layer is transferred to the linear polarization plate. How to do is described.

JP, 2015-21976, A

Such a horizontally aligned liquid crystal layer has a problem that wrinkles and irregular foreign matters are likely to occur from the end portion when transferring from the substrate to the linear polarizing plate. Patent Document 1 describes a method of suppressing the generation of foreign matter by adjusting the width relationship with 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, when transferring the liquid crystal layer to the optical functional layer, a laminate suitable for producing an optical laminate having a liquid crystal layer in which generation of wrinkles and irregularly shaped foreign matter is suppressed, a laminate with an adhesive layer, An object is to provide an optical layered body with a base material layer, an optical layered body, and a method for producing the same.

The present invention provides 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 shown below.
[1] A laminate in which a first liquid crystal layer-containing layer including a first liquid crystal layer is provided on a base material layer-containing layer including a base material layer,
The base material layer-containing layer is peelable 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 a surface of the first liquid crystal layer,
The laminate in which the displacement amount in the puncture test of the first liquid crystal layer-containing layer is 2.0 mm or less.
[2] The laminate according to [1], wherein the adhesive force between the base material layer-containing layer and the first liquid crystal layer-containing layer is 0.05 N/25 mm or more.
[3] The base material 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 alignment layer side of the base material layer-containing layer.
[4] The first liquid crystal layer-containing layer further includes an alignment layer,
The said base material layer containing layer is a laminated body as described in [1] or [2] provided in the said alignment layer side of the said 1st 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 first liquid crystal layer-containing layer side of the laminate,
The first liquid crystal layer-containing layer is a laminated body with an adhesive layer, which has an unlaminated region in which the adhesive layer is not laminated.
[6] The laminated body with an adhesive layer according to [5], wherein the non-laminated region is present in at least one end portion in the width direction of the laminated body with an adhesive layer.
[7] An optical laminate with a substrate layer, which comprises 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, which is provided on the first liquid crystal layer-containing layer side of the laminate.
[8] An optical layered body with a substrate layer, wherein an optical functional layer is provided on the adhesive layer of the layered body with an adhesive layer according to [5] or [6].
[9] The optical layered body with a substrate layer according to [7] or [8], wherein the optical functional layer includes a polarizing layer.
[10] The optical layered body with a substrate layer according to any one of [7] to [9], wherein the optical functional layer includes a second liquid crystal layer.
[11] An optical laminate including 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,
The optical layered body, wherein the displacement amount in the puncture test of the first' liquid crystal layer-containing layer is 2.0 mm or less.
[12] The first liquid crystal layer-containing layer further includes an alignment layer,
The optical layered body according to [11], in which the alignment layer is provided on a side of the first liquid crystal layer opposite to the adhesive layer.
[13] A method for producing an optical layered body, which includes 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 layered body, comprising a step of peeling the layer containing a substrate layer from the optical layered body with a substrate layer according to any one of [7] to [10].

According to the present invention, a laminated body suitable for producing an optical laminated body having a liquid crystal layer in which generation of wrinkles and irregular foreign matters is suppressed at the time of transfer of the liquid crystal layer to the optical functional layer, a laminated body with an adhesive layer A body, an optical layered body with a base layer, an optical layered body, and a method for producing the same can be provided.

It is a schematic sectional drawing which shows an example of the laminated body of this invention typically. It is a schematic sectional drawing which shows the other example of the laminated body of this invention typically. It is a schematic sectional drawing which shows typically an example of the laminated body with an adhesive layer of this invention. It is a schematic sectional drawing which shows typically an example of the optical laminated body with a base material layer of this invention. It is an outline sectional view showing typically other examples of an optical layered product with a substrate layer of the present invention. It is a schematic sectional drawing which shows typically an example of the manufacturing process of the optical laminated body of this invention. It is a schematic sectional drawing which shows typically the other example of the manufacturing process of the optical laminated body of this invention.

Hereinafter, preferred embodiments of the laminate, the laminate with an adhesive layer, the optical laminate with a base layer, the optical laminate, and the method for producing the same of the present invention will be described with reference to the drawings. In addition, you may combine each embodiment and its modification shown below arbitrarily. Further, in each of the embodiments and the modified examples thereof, the same members as those described in the embodiment or the modified examples preceding them may be denoted by the same reference numerals, and the description thereof may be omitted.

[Embodiment 1 (Laminate)]
FIG. 1 is a schematic cross-sectional view schematically showing an example of the laminated body of the present embodiment. In the figure, W represents the width direction. As shown in FIG. 1, the laminated body 1a of the present embodiment has a first liquid crystal layer 13a (first liquid crystal layer-containing layer) provided on a base material layer-containing layer 10a including a base material layer 11a. As shown in FIG. 1, the base material layer-containing layer 10a can include a base material layer 11a and an alignment layer 12a, and the first liquid crystal layer 13a is provided on the alignment layer 12a side of the base material layer-containing layer 10a. Thus, the first liquid crystal layer 13a is in direct contact with the alignment layer 12a. The first liquid crystal layer 13a contains a liquid crystal compound aligned in the horizontal direction with respect to the surface thereof. Further, the base material layer-containing layer 10a is peelable from the first liquid crystal layer 13a. The laminated body 1a may have another layer on the first liquid crystal layer 13a. The laminated body 1a may be a sheet-shaped film or a long film.

In the cross section in the width direction of the laminate 1a, as shown in FIG. 1, the base layer 11a, the alignment layer 12a, and the first liquid crystal layer 13a have a shorter length in the width direction in the order of width of the alignment layer 12a. The positions of both ends are inside the width direction 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 inside of the alignment layer 12a in the width direction. It is in. The laminated body 1a is not limited to those in which the widthwise length of each layer and the widthwise positions of both ends of each layer have the above-described relationship. For example, the base material layer 11a and the alignment layer 12a may have the same length in the width direction, and the positions of the width direction both ends in the width direction cross section of the laminate 1a may be the same. Further, 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 width direction cross section of the laminate 1a. The alignment layer 12a may be shorter than the first liquid crystal layer 13a, and the widthwise ends of the alignment layer 12a may be inside the widthwise ends of the first liquid crystal layer 13a. The laminated body 1a shown in FIG. 1 has a structure symmetrical in the width direction, but may have an asymmetric structure in the width direction.

The base material layer 11a can have a function as a support layer that supports the alignment layer 12a and the first liquid crystal layer 13a. The alignment layer 12a can have an alignment regulating force for horizontally aligning the liquid crystal compound used to form the first liquid crystal layer 13a with the liquid crystal compound.

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

The displacement amount of the first liquid crystal layer 13a in the puncture test is 2.0 mm or less, preferably 1.5 mm or less, 1.2 mm or less, or 1.1 mm or less. Further, it 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. If the displacement amount in the puncture test is too small, defects such as cracks tend to occur during processing such as polishing. In addition, by setting the displacement amount in the puncture test to be in the range of 0.5 mm or more and 2.0 mm or less, it is possible to effectively suppress the generation of foreign matter during transfer of the first liquid crystal layer 13a, and it is also suitable for processing in processing such as polishing. It becomes easy to form the excellent first liquid crystal layer 13a. The displacement amount in the puncture test can be measured by using a puncture tester as described in Examples described later.

The laminate 1a is used to obtain an optical laminate 3a with a base layer (FIG. 4) having an adhesive layer 30a and an optical functional layer 60a as described below. Then, the optical layered body 4a (FIG. 6) can be obtained by peeling the base material layer-containing layer 10a. When the displacement amount in the puncture 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 optical layered body 3a with a base layer as described above. At this time, in the first liquid crystal layer 13a, a laminated region 13ay, which is a region where the adhesive layer 30a is laminated, and a non-laminated region 13ax, which is a region where the adhesive layer 30a is not laminated (indicated by a diagonal line rising to the right in FIG. 4). The first liquid crystal layer 13a can be satisfactorily separated from each other. On the other hand, when the displacement amount in the puncture test of the first liquid crystal layer 13a exceeds 2.0 mm, the first liquid crystal layer 13a is easily stretched, so that the optical layered body with base material layer 3a is changed to the base material layer-containing layer 10a. When peeling off, the first liquid crystal layer 13a is not separated at the intended position between the laminated region 13ay and the non-laminated region 13ax, and the separated portion becomes an irregularly shaped foreign matter, and wrinkles occur in the separated portion. It is easy for problems to occur.

The displacement amount in the puncture test of the first liquid crystal layer 13a is, for example, the kind of the polymerizable liquid crystal compound used for obtaining the first liquid crystal layer 13a containing the horizontally aligned liquid crystal compound, the polymerizable liquid crystal compound in the first liquid crystal layer 13a. Degree of polymerization (curing degree), type and amount of additives such as a polymerization initiator, a reactive additive, a leveling agent, a polymerization inhibitor, a crosslinking agent, etc., contained in the first liquid crystal layer 13a, and a thickness of the first liquid crystal layer 13a. Etc. can be adjusted. When the conditions other than the thickness are the same, the first liquid crystal layer 13a is less likely to expand as the thickness is larger, and the displacement amount in the puncture test of the first liquid crystal layer 13a tends to be smaller. The thickness of the first liquid crystal layer 13a can be appropriately selected depending on the type of display device applied, but is preferably 0.3 μm or more, 0.5 μm or more, or 1 μm or more. Also, it is usually 10 μm or less, may be 5 μm or less, and is preferably 3 μm or less.

The adhesive force between the base material layer-containing layer 10a and the first liquid crystal layer 13a is preferably 0.05 N/25 mm or more, may be 0.06 N/25 mm or more, and is 0.07 N/25 mm or more. , May be 0.08 N/25 mm or more, and may be 0.10 N/25 mm or more. The upper limit of the adhesive force between the base material layer-containing layer 10a and the first liquid crystal layer 13a is not particularly limited as long as the base material layer-containing layer 10a can be separated from the first liquid crystal layer 13a, but, for example, It can be 0.5 N/25 mm or less. The adhesive force can be measured by the method described in Examples below.

When the adhesive force between the base layer-containing layer 10a and the first liquid crystal layer 13a is less than 0.05 N/25 mm, when the base layer-containing layer 10a is peeled from the optical layered body 3a with a base layer described later. In addition, the first liquid crystal layer 13a is less likely to be properly separated between the laminated region 13ay and the non-laminated region 13ax, and the above-mentioned problems are likely to occur.

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

The laminated body of the present embodiment may be modified as in the modified examples described below.
(Modification 1 of Embodiment 1)
In the above description, 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 includes the alignment layer 12a. However, the laminated body shown in FIG. 2 may be used. FIG. 2 is a schematic cross-sectional view schematically showing another example of the laminated body of this embodiment. As shown in FIG. 2, the laminate 1b contains a first liquid crystal layer having an alignment layer 12b and a first liquid crystal layer 13b containing a horizontally aligned liquid crystal compound on a base layer 11b (base layer containing layer). The base layer 11b is provided on the alignment layer 12b side of the first liquid crystal layer-containing layer 20b. The first liquid crystal layer 13b is in direct contact with the alignment layer 12b. Further, the base material layer 11b forming the laminated body 1b is peelable from the first liquid crystal layer-containing layer 20b.

In the laminate 1b, the displacement amount in the puncture 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. The range that can be adopted as the displacement amount in the puncture test of the first liquid crystal layer-containing layer 20b is the same as the range described in the above embodiment, and thus the description thereof is omitted. As a method of adjusting the displacement amount in the puncture test of the first liquid crystal layer-containing layer 20b, in addition to the method of adjusting the displacement amount in the puncture test of the first liquid crystal layer, as described in the above embodiment, It can also be adjusted by the kind and amount of components contained in the alignment layer 12b, the thickness of the alignment layer 12b, and the like. When the conditions other than the thickness are the same, the first liquid crystal layer-containing layer 20b is less likely to expand as the thickness is larger, and the displacement amount in the puncture test of the first liquid crystal layer-containing layer 20b tends to be smaller. The thickness of the first liquid crystal layer-containing layer 20b can be appropriately selected according to the type of display device applied, but is preferably 0.4 μm or more, may be 1 μm or more, and is usually 12 μm or less, It is preferably 8 μm or less, and more preferably 5 μm or less. The thickness of the first liquid crystal layer 13b is preferably 0.3 μm or more, may be 0.5 μm or more, may be 1 μm or more, and is usually 10 μm or less and 5 μm or less. It may be present, and is preferably 3 μm or less. The thickness of the alignment layer 12b is preferably 0.01 μm or more, may be 0.05 μm or more, and is usually 10 μm or less, may be 3 μm or less, and may be 0.5 μm or less. Is preferred.

The layered product 1b is also used to obtain an optical layered body with a base layer having an adhesive layer and an optical layered body, and an optical layered body to be described later by peeling the base layer 11b from the optical layered body with a base layer. The body 4b (FIG. 7) can be obtained. When the displacement amount in the puncture 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 layered body with substrate layer. In addition, the first liquid crystal layer-containing layer 20b is formed between the laminated region of the first liquid crystal layer-containing layer 20b where the adhesive layer is laminated and the unlaminated region where the adhesive layer is not laminated. It can be separated well. On the other hand, when the displacement amount of the first liquid crystal layer-containing layer 20b in the puncture test exceeds 2.0 mm, the first liquid crystal layer-containing layer 20b is easily stretched. When peeling 11b, the first liquid crystal layer-containing layer 20b is not separated at the intended position between the laminated region 13ay and the non-laminated region 13ax, and the separated portion becomes a foreign matter having an irregular shape. Problems such as occurrence are likely to occur. The preferable range of the displacement amount in the puncture test of the first liquid crystal layer-containing layer 20b can be the same as the preferable range of the displacement amount in the puncture test of the first liquid crystal layer 13a.

The adhesive force between the base material layer 11b and the first liquid crystal layer-containing layer 20b is preferably 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 embodiment, and the adjusting method is also the same as the range described in the above embodiment, and therefore the description thereof is omitted. When the adhesive force between the base material layer 11b and the first liquid crystal layer-containing layer 20b is less than 0.05 N/25 mm, when the base material layer 11b is peeled from the optical layered body with the base material layer, a layered region is formed. The first liquid crystal layer-containing layer 20b is less likely to be well separated from the non-laminated region, and the above-mentioned problems are likely to occur. The preferable range of the adhesive force between the base material layer 11b and the first liquid crystal layer-containing layer 20b is the same as the preferable range of the adhesive force between the base material layer-containing layer 10a and the first liquid crystal layer 13a. be able to.

(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 include the alignment layer.

[Embodiment 2 (laminated body with adhesive layer)]
FIG. 3 is a schematic cross-sectional view schematically showing an example of the laminated body with the adhesive layer of the present embodiment. In the figure, W represents the width direction. As shown in FIG. 3, the laminated body 2a with an adhesive layer of the present embodiment has the laminated body 1a and the adhesive layer 30a shown in FIG. 1, and the adhesive layer 30a is on the first liquid crystal layer 13a side of the laminated body 1a. It is provided in. The adhesive layer 30a is a layer formed of an adhesive or a pressure-sensitive adhesive. The laminate 1a is the one described in the above embodiment, and the laminate 2a with an adhesive layer is obtained by applying an adhesive or a pressure-sensitive adhesive to the laminate 1a, or transferring the pressure-sensitive adhesive layer, for example. Thus, the adhesive layer 30a can be formed and obtained. The laminated body with an adhesive layer 2a may have a release layer that covers the surface of the adhesive layer 30a on the side opposite to the first liquid crystal layer 13a. The laminated body 2a with an adhesive layer may be a sheet-shaped film or a long film.

As shown in FIG. 3, the adhesive layer 30a has a shorter width in the width direction than the first liquid crystal layer 13a in the width direction cross section of the laminated body 2a with an adhesive layer, and the adhesive layer 30a is provided at both ends in the width direction. The positions are on the inner side in 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 where the adhesive layer 30a is laminated, and a non-laminated region 13ax, which is a region where the adhesive layer 30a is not laminated (indicated by a diagonal line rising to the right in FIG. 4). ) And. As shown in FIG. 3, in the cross section in the width direction of the laminated body 2a with an adhesive layer, by providing the unlaminated regions 13ax at both ends of the first liquid crystal layer 13a, the laminated body 2a with an adhesive layer, the laminated body 1a, or the adhesive layer In the optical layered body 3a with a substrate layer (FIG. 4) described later obtained by using the laminated body 2a with adhesive, the adhesive layer is prevented from protruding, and when the adhesive layer is transported, the transportation path is contaminated by the adhesive layer. Can be suppressed.

The adhesive layer 30a in the laminated body 2a with an adhesive layer is provided on the first liquid crystal layer 13a, and if the laminated region 13ay and the non-laminated region 13ax can be formed in the first liquid crystal layer 13a, the adhesive shown in FIG. The structure is not limited to the layered laminate 2a. For example, one end of the adhesive layer 30a in the width direction may be located at the same position as one end of the first liquid crystal layer 13a in the width direction. Further, in the plan view of the first liquid crystal layer 13a, the adhesive layer 30a is provided on the first liquid crystal layer 13a so that a non-laminated region is formed in the central portion and a laminated region surrounding the non-laminated region is formed. Good. The first liquid crystal layer 13a may have one or more laminated regions 13ay and one or more non-laminated regions 13ax, and may have two or more each, and the number of laminated regions 13ay and non-laminated regions 13ax is , May be the same as or different from each other.

The laminate 2a with an adhesive layer is used to obtain an optical laminate 3a with a base layer (FIG. 4) having an optical functional layer 60a, as will be described later. The optical layered body 4a (FIG. 6) can be obtained by peeling the material layer-containing layer 10a. Since the laminated body with an adhesive layer 2a includes the first liquid crystal layer 13a that includes a horizontally aligned liquid crystal compound and has a displacement amount of 2.0 mm or less in the puncture test, as described above, When the base layer-containing layer 10a is peeled from the layered optical laminate 3a, the first liquid crystal layer 13a can be favorably separated between the laminated region 13ay and the non-laminated region 13ax of the first liquid crystal layer 13a. ..

Further, in the laminated body with an adhesive layer 2a, the adhesive force between the base layer containing layer 10a and the first liquid crystal layer 13a is 0.05 N/25 mm or more, so that the laminated region 13ay of the first liquid crystal layer 13a becomes The first liquid crystal layer 13a can be favorably separated from the non-laminated region 13ax.

The laminated body with the adhesive layer of the present embodiment may be modified as in the modified examples described below.
(Modification 1 of Embodiment 2)
In the above description, the laminated body with an adhesive layer 2a having the laminated body 1a and the adhesive layer 30a shown in FIG. 1 has been described as an example, but the laminated body may be the laminated body 1b shown in FIG. The laminated body with an adhesive layer using the laminated body 1b is used to obtain an optical laminated body with a base layer having an optical functional layer to be described later. From the optical laminated body with a base layer to the base layer 11b (base material). By peeling the layer-containing layer), an optical layered body 4b (FIG. 7) described later can be obtained. In the laminated body with the adhesive layer using the laminated body 1b, the displacement amount in the puncture 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. When peeling the base material layer 11b from the optical layered body with the base material layer, in the laminated area of the first liquid crystal layer-containing layer 20b where the adhesive layer is provided and in the area where the adhesive layer is not provided. The first liquid crystal layer-containing layer 20b can be favorably separated from a certain non-laminated region. Further, when the adhesive force between the base material layer 11b and the first liquid crystal layer-containing layer 20b is 0.05 N/25 mm or more, when the base material layer 11b is peeled from the optical layered body with the base material layer, It becomes easy to favorably separate the first liquid crystal layer-containing layer 20b between the laminated region and the non-laminated region.

(Modification 2 of Embodiment 2)
In the above description, the laminate with the adhesive layer including the alignment layer is described as an example, but the laminate with the adhesive layer may not include the alignment layer.

[Embodiment 3 (optical layered body with substrate layer)]
FIG. 4 is a schematic cross-sectional view schematically showing an example of the optical layered body with the base material layer of the present embodiment. In the figure, W represents the width direction. As shown in FIG. 4, the optical layered body 3a with a substrate layer of the present embodiment has the layered body 1a shown in FIG. 1, an adhesive layer 30a, and an optical functional layer 60a in this order, and the adhesive layer 30a is , Provided on the first liquid crystal layer 13a side of the laminated body 1a. The optical layered body 3a with a base material layer may have a structure in which the first liquid crystal layer 13a of the layered body 1a and the optical function layer 60a face each other with the adhesive layer 30a interposed therebetween. The layer 60a may be attached to the adhesive layer 30a via the adhesive layer 30a, or the optical function layer 60a may be provided on the adhesive layer 30a of the laminate 2a with an adhesive layer shown in FIG. The description of the base layer 11a, the alignment layer 12a, the first liquid crystal layer 13a, and the adhesive layer 30a included in the optical layered body 3a with a base layer is as described in the above embodiment. The optical functional layer 60a may include, for example, a polarizing layer, may include a second liquid crystal layer that is a liquid crystal layer formed by polymerizing a polymerizable liquid crystal compound, and may include a polarizing layer and a second liquid crystal layer. May be included. The optical layered body 3a with a substrate layer may be a sheet-shaped film or a long film.

As shown in FIG. 4, the optical function layer 60a has a length in the width direction longer than that of the adhesive layer 30a in the width direction cross section of the optical layered body 3a with base material layer. The positions of both ends are outside in the width direction with respect to the positions of both ends in the width direction of the adhesive layer 30a. The length in the width direction and the positions of both ends in the width direction of the optical functional layer 60a are not limited to those shown in FIG. 4, but due to the above relationship, when the optical layered body with substrate layer 3a is conveyed, It is possible to prevent the adhesive layer from protruding and the transport path from being contaminated. Note that 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 function layer 60a and each layer of the laminate 1a, and the length in the width direction of the optical function layer 60a is equal to that of the laminate 1a. It may be longer or shorter than all the layers formed, may be different from any layer forming the laminated body 1a, and may be the same as any layer. The positions of both ends in the width direction of the optical function layer 60a may be outside or inside in the width direction of all the layers forming the laminated body 1a, and are the same as any layers forming the laminated body 1a. It may be.

As described later, the optical layered body 4a (FIG. 6) can be obtained by peeling the substrate layer-containing layer 10a from the optical layered body 3a with a substrate layer. Since the optical layered body 3a with a base layer includes the first liquid crystal layer 13a that includes a horizontally aligned liquid crystal compound and has a displacement amount of 2.0 mm or less in the puncture test, as described above, When the base layer-containing layer 10a is peeled from the base layer-attached optical laminate 3a, the first liquid crystal layer 13a is favorably separated between the laminated region 13ay and the non-laminated region 13ax of the first liquid crystal layer 13a. be able to.

Further, in the optical layered body with a base material layer 3a, the adhesive force between the base material layer-containing layer 10a and the first liquid crystal layer 13a is 0.05 N/25 mm or more, so that the laminated area of the first liquid crystal layer 13a is The first liquid crystal layer 13a can be favorably separated between the 13ay and the non-laminated region 13ax.

The optical layered body with a base material layer of the present embodiment may be modified as in the following modifications.
(Modification 1 of Embodiment 3)
In the above description, the laminate 1a shown in FIG. 1, the adhesive layer 30a, and the optical laminate 3a with a base layer having the optical function layer 60a have been described as an example, but the laminate is the laminate shown in FIG. It may be the body 1b. The optical layered body 4b (FIG. 7) described below can be obtained by peeling the base layer 11b (base layer-containing layer) from the optical layered body with a base layer using the layered body 1b. In the optical layered body with the substrate layer using the layered body 1b, the displacement amount in the puncture 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. Thereby, when the base material layer 11b is peeled from the optical layered body with the base material layer, the first liquid crystal layer-containing layer 20b has a laminated area in which the adhesive layer is laminated and the adhesive layer is not laminated. The first liquid crystal layer-containing layer 20b can be satisfactorily separated from the non-laminated region that is the region. Further, when the adhesive force between the base material layer 11b and the first liquid crystal layer-containing layer 20b is 0.05 N/25 mm or more, when the base material layer 11b is peeled from the optical layered body with the base material layer, It becomes easy to favorably separate the first liquid crystal layer-containing layer 20b between the laminated region and the non-laminated region.

(Modification 2 of Embodiment 3)
In the above description, the laminated body with the adhesive layer including the alignment layer is described as an example, but the optical laminated body with the base layer may not include the alignment layer.

(Modification 3 of Embodiment 3)
In the above description, the optical layered body 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 layered body 1a shown in FIG. Good. FIG. 5: is a schematic sectional drawing which shows typically the other example of the optical laminated body with a base material layer of this embodiment. The optical layered body 3c with a base layer shown in FIG. 5 includes a layered body 1a, an adhesive layer 30c, and an optical functional layer 60c in this order. The description of the stacked body 1a is as described in the above embodiment. The adhesive layer 30d is similar to the adhesive layer 30a, and the optical functional layer 60c has the same layer structure as that of the laminated body 1a shown in FIG.

In the optical layered body 3c with a base layer, the adhesive layer 30c is provided on the first liquid crystal layer 13a (second liquid crystal layer) side of the optical function layer 60c. Further, the optical layered body can be obtained by peeling the substrate layer-containing layer 10a forming the layered body 1a from the optical layered body 3c with a substrate layer.

In the optical layered body 3c with a base layer, the case where the layered body 1a shown in FIG. 1 is used as the optical functional layer 60c has been described as an example, but the layered body 1b shown in FIG. 2 may be used as the optical functional layer. .. The displacement amount in the puncture test of the first liquid crystal layer or the liquid crystal layer-containing layer of the laminate forming the optical function layer may be 2.0 mm or less, or may be more than 2.0 mm.

[Embodiment 4 (optical laminate and method for manufacturing the same)]
FIG. 6 is a schematic sectional view schematically showing an example of a manufacturing process of the optical layered body of the present embodiment. In the figure, W represents the width direction. As shown in FIG. 6, the optical layered body 4a of the present embodiment includes a first' liquid crystal layer 13'a (first' liquid crystal layer-containing layer), an adhesive layer 30a, and an optical functional layer 60a in this order. .. The first' liquid crystal layer 13'a contains a liquid crystal compound aligned in the horizontal direction with respect to the surface thereof. The description of the adhesive layer 30a and the optical function layer 60a included in the optical layered body 4a is as described in the above embodiment. The optical laminate 4a may be a sheet-shaped film or a long film.

In the cross section in the width direction of the optical laminate 4a, 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 of both ends in the width direction are also the same. be able to. Such an optical layered body 4a can be obtained, for example, through a step of peeling the substrate layer-containing layer 10a from the optical layered body 3a with a substrate layer shown in FIG. When the substrate layer-containing layer 10a is peeled from the optical layered body 3a with a substrate layer, as shown in FIG. 6, the unlaminated region 13ax exists on the substrate layer-containing layer 10a and the laminated region 13ay is on the adhesive layer 30a. As described above, the first liquid crystal layer 13a can be separated, and the laminated region 13ay existing on the adhesive layer 30a becomes the first' liquid crystal layer 13'a. In the separation of the first liquid crystal layer 13a as described above, the first liquid crystal layer 13a in the optical layered body 3a with a base layer has a non-laminated region 13ax where the adhesive layer 30a is not provided (indicated by a diagonal line rising to the right in FIG. 4). Part) and the laminated region 13ay in which the adhesive layer 30a is provided. Specifically, since the laminated region 13ay is a region where the adhesive layer 30 is provided, even if the base layer-containing layer 10a is peeled off, it is fixed to the adhesive layer 30a and is hardly peeled off together with the base layer-containing layer 10a. Has become. On the other hand, since the non-laminated region 13ax is a region in which the adhesive layer 30a is not provided, when the base layer-containing layer 10a is peeled off, it is easily peeled off together with the base layer-containing layer 10a. As a result, when the base layer-containing layer 10a is peeled from the optical layered body with a base layer 3a, the first liquid crystal layer 13a is separated into a non-laminated region 13ax and a laminated region 13ay.

In the present embodiment, as described above, the first liquid crystal layer 13a in the optical layered body 3a with a base material layer includes a horizontally aligned liquid crystal compound, and the displacement amount in the puncture test is 2.0 mm or less. Therefore, the non-laminated region 13ax and the laminated region 13ay can be favorably separated by peeling the substrate layer-containing layer 10a from the optical laminate 3a with a substrate layer, and the laminated region 13ay and the non-laminated region 13ax can be separated from each other. It is possible to prevent the first liquid crystal layer 13a from not being separated at an intended position such as between, and from causing a defect such as a separation portion having an indefinite shape without separation and a wrinkle occurring at the separation portion. Further, when the displacement amount in the puncture test is in 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 the positions of both ends of the adhesive layer 30 in the width direction are set. It becomes easy to obtain the optical laminated body 4a having the same value.

The displacement amount of the first liquid crystal layer 13'a of the optical layered body 4a in the puncture test is 2.0 mm or less and 1.5 mm or less, like the first liquid crystal layer 13a described in the above embodiment. The thickness is preferably 1.2 mm or less, may be 1.1 mm or less, and may be 0 (zero) mm or more, but is usually 0.1 mm or more and 0 It is preferably 0.3 mm or more, and more preferably 0.5 mm or more. As described above, when the optical laminate 4a is obtained from the optical laminate 3a with a base layer, the first' liquid crystal layer 13'a is a layer derived from the first liquid crystal layer 13a described in the above embodiment. Therefore, it can have the same characteristics as the first liquid crystal layer 13a.

The optical layered body 4a can also be used as the optical function layer described in the above embodiment. The optical layered body with the base material layer using the optical layered body 4a as the optical functional layer has a liquid crystal layer-containing layer of the layered body and the first' liquid crystal layer 13'a (second layer) of the optical layered body 4a via the adhesive layer. The liquid crystal layer) may be opposed. Further, the optical layered body can be obtained by peeling the layer containing the substrate layer from the optical layered body with the substrate layer.

The optical layered body of the present embodiment and the method for manufacturing the same may be modified as in the modifications described below.
(Modification 1 of Embodiment 4)
In the above description, the optical laminated body 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 laminated body further includes an alignment layer. The optical laminated body shown in FIG. 7 may be used. FIG. 7 is a schematic cross-sectional view schematically showing another example of the optical layered body of the present embodiment. As shown in FIG. 7, the optical laminate 4b includes a first' liquid crystal layer-containing layer 20'b including an alignment layer 12'b and a first' liquid crystal layer 13'b, an adhesive layer 30a, and an optical functional layer 60a. And 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 in the width direction of the optical laminate 4b, the first' liquid crystal layer-containing layer 20'b (the alignment layer 12'b and the first' liquid crystal layer 13'b) and the adhesive layer 30a have a width as shown in FIG. The length in the direction is the same, and the positions of both ends in the width direction can be the same. Such an optical layered body 4b can be obtained, for example, by peeling the base layer 11b (base layer containing layer) from the optical layered body with a base layer including the layered body 1b (FIG. 2). When the substrate layer 11b is peeled from the optical layered body with the substrate layer including the layered body 1b, the same principle as in the case of obtaining the optical layered body 4a from the optical layered body 3a with the substrate layer shown in FIG. As shown in the figure, the first liquid crystal layer-containing layer 20b (FIG. 2) has a non-laminated region (a region shown by a diagonal line rising to the right in FIG. 7) in which the adhesive layer 30a is not laminated, and the adhesive layer 30a is laminated. It is separated into a laminated area which is a predetermined area. In the laminate 1b shown in FIG. 2, the displacement amount in the puncture 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 base material layer 11b is peeled off from the optical layered body with the base material layer including the laminated body 1b, the first liquid crystal layer-containing layer 20b can be favorably separated from the non-laminated region and the laminated region. As a result, the above-mentioned 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 at both ends of the adhesive layer 30a in the width direction. An optical layered body 4b having the same position as that of is obtained.

The displacement amount in the puncture test of the first liquid crystal layer-containing layer 20′b of the optical layered body 4b is 2.0 mm or less, similarly to the first liquid crystal layer-containing layer 20b described in the above embodiment, It is preferably 1.5 mm or less, 1.2 mm or less, 1.1 mm or less, and 0 (zero) mm or more, but usually 0.1 mm or more. And preferably 0.3 mm or more, and more preferably 0.5 mm or more. As described above, when the optical layered body 4b is obtained from the optical layered body with the substrate layer including the layered body 1b, it is included in the first' liquid crystal layer-containing layer 20'b and the first' liquid crystal layer-containing layer 20'b. Since the alignment layer 12'b and the first' liquid crystal layer 13'b are layers derived from the first liquid crystal layer-containing layer 20b described in the above embodiment, the first liquid crystal layer-containing layer 20b, the alignment layer 12b, And the first liquid crystal layer 13b may have the same characteristics.

The optical layered body 4b can also be used as the optical function layer described in the above embodiment. The optical layered body with a base layer using the optical layered body 4b as an optical functional layer is such that the liquid crystal layer-containing layer of the layered body and the alignment layer 12'b of the optical layered body 4b face each other with an adhesive layer interposed therebetween. can do. Further, the optical layered body can be obtained by peeling the layer containing the substrate layer from the optical layered body with the substrate layer.

(Modification 2 of Embodiment 4)
In the above, the case where the substrate layer-containing layer 10a is peeled from the optical layered body 3a with a substrate layer shown in FIG. 4 to obtain the optical layered body 4a (FIG. 6) has been described, but with the substrate layer shown in FIG. The base layer-containing layer 10a may be peeled from the optical layered body 3c to obtain an optical layered body.

The optical layered body obtained by peeling the substrate layer-containing layer 10a from the optical layered body 3c with a substrate layer shown in FIG. 5 can also be used as the layered body described in the above embodiment. In this case, an optical layered body with a base material layer can be obtained by providing an adhesive layer on the side from which the base material layer-containing layer 10a is peeled off and laminating an optical functional layer on the adhesive layer. An optical laminated body can also be obtained by peeling the base layer-containing layer 10a from this optical laminated body with a base layer. Further, in this case, as described in the previous embodiment, the displacement amount in the puncture test of the first liquid crystal layer 13a included in the optical functional layer 60c is preferably 2.0 mm or less, and the optical functional layer 60c It is preferable that the adhesive force between the base layer-containing layer 10a and the first liquid crystal layer 13a included in 1 is also 0.05 N/25 mm or more. Accordingly, by peeling the base material layer 11a included in the optical function layer 60c, the first liquid crystal layer 13a included in the optical function layer 60c can be favorably separated in the laminated region and the non-laminated region.

The optical layered body obtained by peeling the substrate layer-containing layer 10a from the optical layered body 3c with a substrate layer shown in FIG. 5 can also be used as the optical functional layer described in the above embodiment.

(Modification 3 of Embodiment 4)
In the above description, the case where the base layer-containing layer 10a is peeled from the base layer-containing optical stack 3a having the unlaminated regions 13ax at both ends in the width direction to manufacture the optical stack 4a has been described as an example. It is not limited to this. For example, in a plan view of the optical layered body with a base material layer, even when the central part of the first liquid crystal layer has a non-laminated area and the laminated area surrounds the non-laminated area, By peeling the first peeling layer from the body, the first liquid crystal layer can be favorably separated between the non-laminated region and the laminated region. In this case, in the optical layered body, the contour position of the first' liquid crystal layer and the contour position of the adhesive layer in the plan view can be made to coincide with each other.

Although the embodiments of the present invention and the modifications thereof have been described above, the present invention is not limited to these embodiments and the modifications thereof. For example, the structures of the above-described embodiments and the modifications thereof and It is also possible to carry out the steps in combination. Hereinafter, each item common to all the embodiments and the modifications thereof will be described in detail.

(Optical functional layer)
The optical functional layer is not particularly limited in its constitution, but a polarizing layer, a polarizing plate having a protective layer formed on at least one surface of the polarizing layer, a polarizing plate with a protective film having a protective film laminated on at least one surface of the polarizing plate, It may be a reflection film, a semi-transmissive reflection film, a brightness enhancement film, an optical compensation film, a film with an antiglare function, a retardation film, or the like, and may have one of these. It may have a multilayer structure having three or more. Further, the optical function layer may include a second liquid crystal layer. In the present specification, the “polarizing layer” refers to a layer having a property of transmitting linearly polarized light having a vibration plane orthogonal to the absorption axis when non-polarized light is incident.

The polarizing layer that may be included in the optical functional layer may be a single layer polyvinyl alcohol resin film in which a dichroic dye is adsorbed and oriented, and a dichroic dye is adsorbed and oriented on a substrate film. It may be a laminated film of two or more layers provided with the polyvinyl alcohol resin layer. Further, the polarizing layer may be a cured film obtained by aligning a dichroic dye with a polymerizable liquid crystal compound and polymerizing the polymerizable liquid crystal compound. In this case, the polarizing layer can also be the second liquid crystal layer.

The second liquid crystal layer, which may be included in the optical function layer, may be formed by polymerizing a polymerizable liquid crystal compound. The second liquid crystal layer is formed by applying a composition for forming a liquid crystal layer containing a polymerizable liquid crystal compound onto a base material layer for the second liquid crystal layer or an alignment layer for the second liquid crystal layer provided thereon and drying the same. It can be formed by polymerizing and curing a polymerizable liquid crystal compound by irradiation with active energy rays such as ultraviolet rays.

(Base material layer)
The base layer is not particularly limited in its structure, 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, stretchability and the like is used. Specifically, polyolefin resins such as polyethylene and polypropylene; cyclic polyolefin resins such as norbornene polymers; polyester resins such as polyethylene terephthalate and polyethylene naphthalate; (meth)acrylic acid, poly(meth)acrylic acid methyl ester, etc. (Meth)acrylic acid type resin; cellulose ester type resin such as triacetyl cellulose, diacetyl cellulose and cellulose acetate propionate; vinyl alcohol type resin such as polyvinyl alcohol and polyvinyl acetate; polycarbonate type resin; polystyrene type resin; poly Arylate-based resin; polysulfone-based resin; polyether-sulfone-based resin; polyamide-based resin; polyimide-based resin; polyetherketone-based resin; polyphenylene sulfide-based resin; polyphenylene oxide-based resin, and mixtures and copolymers thereof. You can Of 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. The above "(meth)acrylic acid" means "at least one of acrylic acid and methacrylic acid".

The base material layer may be a single layer obtained by mixing one kind or two or more kinds of resins, or may have a multilayer structure of two or more layers. In the case of having a multi-layer structure, the resins forming each layer may be the same as or different from each other. When the base material layer is a film made of a resin material, any additive may be added to the base material layer. Examples of the additive include an ultraviolet absorber, an antioxidant, a lubricant, a plasticizer, a release agent, an anti-coloring agent, a flame retardant, a nucleating agent, an antistatic agent, a pigment, and a coloring agent.

The thickness of the base material layer is not particularly limited, but generally it is preferably 1 to 300 μm, more preferably 10 to 200 μm, and further preferably 30 to 120 μm from the viewpoint of workability such as strength and handleability. More preferable.

(Alignment layer)
The laminate may include an alignment layer between the base material 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, a layer having solvent resistance that does not dissolve upon application of the polymerizable liquid crystal composition and the like and heat resistance in the heat treatment for removing the solvent and aligning the polymerizable liquid crystal compound described later is preferable. 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 glob alignment layer having an uneven pattern or a plurality of grooves (grooves) on the layer surface. You can From the viewpoint of easy control of the alignment regulating force, a photo-alignment polymer layer is preferable as the alignment layer. The thickness of the alignment layer is preferably 0.01 μm or more, may be 0.05 μm or more, and is usually 10 μm or less, may be 3 μm or less, and may be 0.5 μm or less. preferable.

The oriented polymer layer can be formed by applying a composition in which an oriented polymer is dissolved in a solvent to the substrate layer to remove the solvent, and performing a rubbing treatment if necessary. In this case, in the orientation polymer layer formed of the orientation polymer, the orientation control force can be arbitrarily adjusted depending on the surface state of the orientation polymer and rubbing conditions. Further, the film strength can be adjusted by adding a crosslinking agent or the like to the oriented polymer.

The photoalignable polymer layer can be formed by applying a composition for forming a photoalignment film containing a polymer or monomer having a photoreactive group and a solvent to the base material layer and irradiating it with polarized light. In this case, in the photoalignable polymer layer, the alignment regulating force can be arbitrarily adjusted by the polarized light irradiation condition or the like with respect to the photoalignable polymer. Further, the film strength can be adjusted by adding a crosslinking agent or the like to the oriented polymer.

The photoreactive group refers to a group that exhibits a liquid crystal aligning ability when irradiated with light. Specific examples thereof include groups involved in photoreaction that is the origin of liquid crystal alignment ability such as orientation induction or isomerization reaction of molecules generated by light irradiation, dimerization reaction, photocrosslinking reaction or photodecomposition reaction. Among them, a group involved in the dimerization reaction or the photocrosslinking reaction is preferable in terms of excellent orientation and film strength. As the photoreactive group, a group having an unsaturated bond, particularly a double bond, is preferable, and a carbon-carbon double bond (C=C bond), a carbon-nitrogen double bond (C=N bond), a nitrogen-nitrogen double bond. A group having at least one selected from the group consisting of a heavy bond (N=N bond) and a carbon-oxygen double bond (C=O bond) is particularly preferable.

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 a structure such as an aromatic Schiff 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 formazan 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 a substituent 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 photodimerization reaction is preferable, the irradiation amount of polarized light required for photoalignment is relatively small, and in that a photoalignment film excellent in thermal stability and stability over time is easily obtained, A cinnamoyl group and a chalcone group are preferred. As the polymer having a photoreactive group, a polymer having a cinnamoyl group such that the end portion of the polymer side chain has a cinnamic acid structure is particularly preferable.

The photo-alignment inducing layer can be formed on the base material layer by applying the photo-alignment film forming composition onto the base material layer. Examples of the solvent contained in the composition include the same solvents as those described below as the solvent that can be used in the polymerizable liquid crystal composition, and may be appropriately selected according to the solubility of the photoreactive group-containing polymer or monomer. You can

The content of the polymer or monomer having a photoreactive group in the composition for forming a photo-alignment film can be appropriately adjusted depending on the kind of the polymer or the monomer and the thickness of the desired photo-alignment polymer layer. It is preferably at least 0.2% by mass, more preferably 0.3 to 10% by mass, relative to the mass of the composition. The composition for forming a photo-alignment film may contain a polymer material such as polyvinyl alcohol or polyimide or a photosensitizer as long as the characteristics of the photo-alignment film are not significantly impaired.

Examples of the method for applying the composition for forming a photo-alignment film to the base material layer include spin coating, extrusion, gravure coating, die coating, bar coating, coating methods such as applicator method, and flexo method. A known method such as a printing method may be used. Examples of the method for removing the solvent from the applied composition for forming a photo-alignment film include a natural drying method, a ventilation drying method, a heat drying method, and a reduced pressure drying method.

To irradiate polarized light, the composition for forming a photo-alignment film applied on the base material layer is directly irradiated with polarized UV on a solvent-removed composition, which is also irradiated with polarized light from the base material layer side, It may be of a type in which polarized light is transmitted and irradiated. Further, it is particularly preferable that the polarized light is substantially parallel light. The wavelength of the polarized light to be irradiated is preferably in the wavelength range in which the photoreactive group of the polymer or monomer having a photoreactive group can absorb light energy. Specifically, UV (ultraviolet) in the wavelength range of 250 to 400 nm is particularly preferable. Examples of the light source used for the irradiation of polarized light include xenon lamps, high-pressure mercury lamps, ultra-high-pressure mercury lamps, metal halide lamps, and ultraviolet lasers such as KrF and ArF, and high-pressure mercury lamps, ultra-high-pressure mercury lamps, and metal halide lamps. More preferable. Among these, a high pressure mercury lamp, an ultrahigh pressure mercury lamp, and a metal halide lamp are preferable because they have high emission intensity of ultraviolet rays having a wavelength of 313 nm. Polarized UV can be irradiated by irradiating the light from the light source through an appropriate polarizer. As such a polarizer, a polarizing filter, a polarizing prism such as Glan-Thompson or Glan-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 patterned slit on the surface of a photosensitive polyimide film, a plate-shaped master having grooves on the surface, and active. A method of forming an uncured layer of an energy ray curable resin, transferring this layer to a base material layer and curing the same, forming an uncured layer of an active energy ray curable resin on the base material layer, and forming a uncured layer on this layer. Alternatively, it can be formed by a method of forming unevenness by pressing a roll-shaped master having unevenness, and then curing.

(First Liquid Crystal Layer and Second Liquid Crystal Layer)
The first liquid crystal layer and the second liquid crystal layer (hereinafter, both may be collectively referred to as “liquid crystal layer”) can be formed using a composition containing a known liquid crystal compound such as a polymerizable liquid crystal compound. .. The type of polymerizable liquid crystal compound is not particularly limited, and rod-shaped liquid crystal compounds, discotic liquid crystal compounds, and mixtures thereof can be used. The polymerizable liquid crystal compound has at least one polymerizable reactive group capable of participating in the polymerization reaction, particularly a photopolymerizable reactive group. The photopolymerizable reactive group refers to a group that can participate in the polymerization reaction by a reaction active species generated from the 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 and oxetanyl group. 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 thermotropic liquid crystal or lyotropic liquid crystal, and the phase ordered structure may be nematic liquid crystal or smectic liquid crystal. The polymerizable liquid crystal compound may be used alone or in combination of two or more kinds.

As the polymerizable liquid crystal compound, for example, JP-A-11-513019, JP-A-2010-31223, JP-A-2010-270108, JP-A-2011-6360, and JP-A-2011-207765 are available. And liquid crystal compounds such as those described in.

When the polymerizable liquid crystal compound is used, the composition containing the polymerizable liquid crystal compound is, in addition to the polymerizable liquid crystal compound, a solvent, a polymerization initiator, a crosslinking agent, a leveling agent, an antioxidant, a plasticizer, a sensitizer, etc. The additive may be further included. Each of these components may be used alone or in combination of two or more.

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

As the solvent, alcohol solvents such as methanol, ethanol, ethylene glycol, isopropyl alcohol, propylene glycol, methyl cellosolve, butyl cellosolve, propylene glycol monomethyl ether, phenol; ester solvents such as ethyl acetate, butyl acetate; acetone, methyl ethyl ketone, cyclopentanone , Cyclohexanone, cycloheptanone, methyl amyl ketone, methyl isobutyl ketone, N-methyl-2-pyrrolidinone and other ketone solvents; pentane, hexane, heptane and other non-chlorinated aliphatic hydrocarbon solvents; toluene, xylene and other non-chlorine solvents Aromatic hydrocarbon solvents; nitrile solvents such as acetonitrile; ether solvents such as propylene glycol monomethyl ether, tetrahydrofuran and dimethoxyethane; chlorinated hydrocarbon solvents such as chloroform and chlorobenzene; and the like. The 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 10000 parts by mass, and more preferably 50 parts by mass to 5000 parts by mass with respect to 100 parts by mass of the solid content. The solid content means the total of components other than the solvent in the polymerizable liquid crystal composition.

The polymerization initiator that may be contained in the composition containing the polymerizable liquid crystal compound is a compound capable of initiating the polymerization reaction of the polymerizable liquid crystal compound, and at a lower temperature condition, the polymerization reaction can be initiated, Polymerizable initiators are preferred. Specific examples include photopolymerization initiators capable of generating active radicals or acids by the action of light, and among them, photopolymerization initiators capable of generating radicals by the action of light are preferable. 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 the photo-radical polymerization initiator, only one kind may be used, or two or more kinds may be used in combination.

A commercially available product may be used as the photoradical polymerization initiator. As such commercial 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 Ltd.), SEQUOL BZ, SEQUOL Z, SEQUOL BEE (above, manufactured by Seiko Chemical Co., Ltd.), kayacure BP100 (manufactured by Nippon Kayaku Co., Ltd.), Kayacure UVI-6992 (manufactured by Dow). ), Adeka Optimer SP-152, Adeka Optimer SP-170, Adeka Optimer N-1717, Adeka Optimer N-1919, Adeka Arculs NCI-831, Adeka Arculs NCI-930 (above, manufactured by ADEKA Corporation) ), TAZ-A, TAZ-PP (all manufactured by Nippon Siber Hegner Co., Ltd.), and TAZ-104 (manufactured by Sanwa Chemical Co., Ltd.).

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 with respect to 100 parts by mass of the total amount of the polymerizable liquid crystal compound. It is a department. Within this range, the reaction of the polymerizable group sufficiently proceeds and the alignment state of the liquid crystal compound is easily stabilized.

The cross-linking agent which may be contained in the composition containing the polymerizable liquid crystal compound is a compound having one or more photo- and heat-reactive groups in the molecule. By using a cross-linking agent, the cross-linking density of the liquid crystal layer changes, and it becomes easier to adjust the film strength. Examples of the cross-linking agent include polyfunctional acrylate compounds, epoxy compounds, oxetane compounds, methylol compounds, and isocyanate compounds. Among them, a polyfunctional acrylate compound is preferable from the viewpoint of uniformity of coating film and adjustment of film strength. The cross-linking agent preferably has 2 or more and 8 or less reactive groups in the molecule, and more preferably 2 or more and 6 or less polymerizable groups.

A commercially available product may be used as the polyfunctional acrylate. As such commercially available products, 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 (Shin Nakamura Chemical Co., Ltd. Made by the company), "ARONIX M-220", "M-325", "M-240", "M-270", "M-309", "M-310", "M-321". , Same "M-350", same "M-360", same "M-305", same "M-306", same "M-450", same "M-451", same "M-408", Same "M-400", same "M-402", same "M-403", same "M-404", same "M-405", same "M-406" (manufactured by Toa Gosei Co., Ltd.), EBECRYL11", same "145", same "150", same "40", same "140", same "180", DPGDA, HDDA, TPGDA, HPNDA, PETIA, PETRA, TMPTA, TMPEOTA, DPHA, EBECRYL series (Daicel)・Cytec Co., Ltd.) and the like.

The content of the cross-linking agent is preferably 1 part by mass to 30 parts by mass, and more preferably 3 parts by mass 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 cross-linking agent is below the lower limit, defects are likely to occur during processing such as polishing, and if it is above the upper limit, the alignment state of the liquid crystal compound becomes unstable and alignment defects are likely to occur.

The reactive additive that may be contained in the composition containing the polymerizable liquid crystal compound is preferably one having a carbon-carbon unsaturated bond and an active hydrogen reactive group in its molecule. Here, the "active hydrogen reactive group" refers to groups which are reactive toward groups having active hydrogen such as carboxyl group (-COOH), a a hydroxyl group (-OH), a amino group (-NH ₂₎ A typical example thereof is a glycidyl group, an oxazoline group, a carbodiimide group, an aziridine group, an imide group, an isocyanate group, a thioisocyanate group, a maleic anhydride group and the like. The number of carbon-carbon unsaturated bonds and active hydrogen-reactive groups that the reactive additive has in the molecule is usually 1 to 20 and preferably 1 to 10 respectively.

In the reactive additive, it is preferable that at least two active hydrogen reactive groups be 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 contained in the molecule of the reactive additive means a carbon-carbon double bond or a carbon-carbon triple bond, and preferably a carbon-carbon double bond. Among them, the reactive additive preferably contains a carbon-carbon unsaturated bond as a vinyl group and/or a (meth)acryl group in the molecule. Further, the active hydrogen-reactive group is preferably at least one selected from the group consisting of an epoxy group, a glycidyl group and an isocyanate group. Particularly, 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.

As the reactive additive, a compound having a (meth)acrylic group and an epoxy group such as methacryloxyglycidyl ether or acryloxyglycidyl ether; a (meth)acrylic group and an oxetane group such as oxetane acrylate or oxetane methacrylate. Compounds having: a compound having a (meth)acryl group and a lactone group, such as lactone acrylate and lactone methacrylate; a compound having a vinyl group and an oxazoline group, such as vinyloxazoline and isopropenyloxazoline; isocyanatomethyl acrylate, isocyanato Examples thereof include compounds having a (meth)acrylic group and an isocyanate group such as methyl methacrylate, 2-isocyanatoethyl acrylate and 20 isocyanatoethyl methacrylate, and oligomers of these monomers. Further, compounds having a vinyl group or 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-isocyanatoethyl methacrylate, or oligomers of these monomers are preferable, and isocyanatomethyl. Acrylate, 2-isocyanatoethyl acrylate, or oligomers of these monomers are particularly preferred.

When the polymerizable liquid crystal composition contains a reactive additive, the content thereof is usually 0.1 part by mass or more and 30 parts by mass or less, preferably 0.1 part by mass, relative to 100 parts by mass of the polymerizable liquid crystal compound. It is from 5 parts by mass to 5 parts by mass.

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.

A commercially available product may be used as the leveling agent, and specifically, DC3PA, SH7PA, DC11PA, SH28PA, SH29PA, SH30PA, ST80PA, ST86PA, SH8400, SH8700, FZ2123 (all manufactured by Toray Dow Corning Co., Ltd.) , KP321, KP323, KP324, KP326, KP340, KP341, X22-161A, KF6001 (all manufactured by Shin-Etsu Chemical Co., Ltd.), TSF400, TSF401, TSF410, TSF4300, TSF4440, TSF4445, TSF-4446, TSF4452, TSF4452, TSF4452. (These are all manufactured by Momentive Performance Materials Japan LLC), Fluorinert (registered trademark) FC-72, FC-40, FC-43, FC-3283 (all manufactured by Sumitomo 3M Limited). ), Megafac (registered trademark) R-08, same R-30, same R-90, same F-410, same F-411, same F-443, same F-445, same F-470, same F-. 477, F-479, F-482, F-483, F-556 (all manufactured by DIC Corporation), Ftop (trade name) EF301, EF303, EF351, EF352 ( As above, Mitsubishi Materials Denshi Kasei Co., Ltd., Surflon (registered trademark) S-381, S-382, S-383, S-393, SC-101, SC-105, KH-40. , SA-100 (all manufactured by AGC Seimi Chemical Co., Ltd.), trade names E1830, E5844 (manufactured by Daikin Fine Chemical Laboratories, Inc.), BM-1000, BM-1100, BYK-352, BYK-353, and BYK-361N (all trade names: manufactured by BM Chemie) and the like can be mentioned. The leveling agents can be used alone or in combination of two or more kinds.

The content of the leveling agent is preferably 0.01 to 5 parts by mass, and more preferably 0.05 to 3 parts by mass with respect to 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 obtained liquid crystal cured film tends to be smoother, which is preferable.

When a polymerizable liquid crystal compound is used, a composition containing the polymerizable liquid crystal compound is applied onto the alignment layer and heated to a phase transition temperature to form a coating film in which the liquid crystal compound is horizontally aligned. A liquid crystal layer, which is a liquid crystal cured layer, can be formed by curing the film. Alternatively, the liquid crystal layer may be formed by applying a composition containing a polymerizable liquid crystal compound onto the base material layer to form a coating film, and stretching this coating film together with the base material layer.

Examples of the method for applying the composition containing the polymerizable liquid crystal compound to the substrate layer or the alignment layer include spin coating method, extrusion method, gravure coating method, die coating method, bar coating method and applicator method. Known methods such as a coating method and a printing method such as a flexo method can be used.

Examples of the method for drying the composition containing the polymerizable liquid crystal compound include a natural drying method, a ventilation drying method, a heat drying method, and a reduced pressure drying method. At this time, by heating the coating film obtained from the polymerizable liquid crystal composition, the solvent can be 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, the material of the base material layer forming the coating film, the alignment layer, etc. For this purpose, it is usually necessary that the temperature is not lower than the liquid crystal phase transition temperature.

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

In the obtained dry coating film, while maintaining the alignment state of the polymerizable liquid crystal compound, by curing the polymerizable liquid crystal compound, a liquid crystal layer which is a polymer of the polymerizable liquid crystal compound existing in a desired alignment state is formed. To be done. Examples of the curing method include thermal polymerization and photopolymerization, and photopolymerization is preferable from the viewpoint of ease of polymerization. In the photopolymerization, as the light to be applied 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 (particularly, the type of the polymerizable group contained in the polymerizable liquid crystal compound) ) And its amount. Specific examples thereof include one or more kinds of light selected from the group consisting of visible light, ultraviolet light, infrared light, X-rays, α rays, β rays, and γ rays, and active electron rays. Among them, ultraviolet light is preferable because it is easy to control the progress of the polymerization reaction and easily adjust the film strength, and that those widely used in the art as a photopolymerization device can be used. It is preferable to select the types of the polymerizable liquid crystal compound and the photoradical polymerization initiator contained in the polymerizable liquid crystal composition so that they can be polymerized. Further, during the polymerization, the polymerization temperature can be controlled by irradiating with light while cooling the dried coating film by an appropriate cooling means. By adopting such a cooling means, if the polymerizable liquid crystal compound is polymerized at a lower temperature, the liquid crystal layer can be appropriately formed even if the base material has a relatively low heat resistance. It is also possible to accelerate the polymerization reaction by raising the polymerization temperature in a range where defects due to heat during light irradiation (deformation due to heat of the substrate, etc.) do not occur.

Examples of the light source for irradiating the dry coating film include a low pressure mercury lamp, a medium pressure mercury lamp, a high pressure mercury lamp, an ultrahigh pressure mercury lamp, a xenon lamp, a halogen lamp, a carbon arc lamp, a tungsten lamp, a gallium lamp, and an excimer laser. Examples include LED light sources that emit light in the wavelength range of 380 to 440 nm, chemical lamps, black light lamps, microwave-excited 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 activating the photopolymerization initiator. The irradiation time with 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 further preferably 0.1 seconds to 1 minute. Is. When it is irradiated once or plural times with such an irradiation intensity of ultraviolet light, the integrated light amount thereof is 10 to 3,000 mJ/cm ² , preferably 50 to 2,000 mJ/cm ² , and more preferably 100 to 1,000 mJ. /Cm ² .

The thickness of the liquid crystal layer can be appropriately selected according to the applied display device, and is preferably 0.3 μm or more, 0.5 μm or more, 1 μm or more, and usually 10 μm. It is the following, and may be 5 μm or less, 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 gives a predetermined retardation to light, and functions as, for example, a ½ wavelength plate, a ¼ wavelength plate, a reverse wavelength dispersion ¼ wavelength plate, or the like. You can list what you do.

(Adhesive layer)
The adhesive layer can be formed by an adhesive, a pressure-sensitive adhesive, or a combination thereof, and is usually one layer, but may be two or more layers. When the adhesive layer is composed of two or more layers, the layers may be made of the same material or different materials.

As the adhesive, for example, one or two or more of water-based adhesives, active energy ray-curable adhesives, and the like can be combined and formed. Examples of the water-based adhesive include a polyvinyl alcohol-based resin aqueous solution and a water-based two-component urethane-based emulsion adhesive. The active energy ray-curable adhesive is an adhesive that is cured by irradiation with active energy rays such as ultraviolet rays, for example, one containing a polymerizable compound and a photopolymerizable initiator, one containing a photoreactive resin, Examples thereof include those containing a binder resin and a photoreactive crosslinking agent. Examples of the polymerizable compound include photopolymerizable monomers such as photocurable epoxy monomers, photocurable acrylic monomers, and photocurable urethane monomers, and oligomers derived from these monomers. Examples of the photopolymerization initiator include those containing a substance that emits active species such as neutral radicals, anion radicals, cation radicals and acids upon irradiation with active energy rays such as ultraviolet rays. The thickness of the adhesive layer (adhesive layer) formed using an 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 adhesive, for example, (meth)acrylic resin, styrene resin, silicone resin, polyester, polyurethane, rubber resin, or polyether is used as a base polymer, and an isocyanate compound, an epoxy compound, an aziridine compound or the like is crosslinked. The composition which added the agent can be mentioned. Above all, a pressure-sensitive adhesive containing a (meth)acrylic resin is preferable because it has excellent optical transparency, adhesiveness, and durability. The thickness of the adhesive layer (adhesive layer) formed using the adhesive is not particularly limited, but is usually 1 μm to 40 μm, and preferably 3 μm to 25 μm 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, and particularly, an adhesive containing an ultraviolet curable epoxy monomer and a photocationic polymerization initiator is used. It is preferably formed.

(Optical laminate)
The optical layered body includes, for example, one including a polarizing layer as an optical functional layer and one including a quarter wavelength plate as the first liquid crystal layer or the second liquid crystal layer, or a quarter wavelength as the optical functional layer. A circularly polarizing plate can be obtained by using a plate-containing material and a polarizing layer containing a liquid crystal compound as the first liquid crystal layer. Such a circularly polarizing plate can be used, for example, as an antireflection film of an organic electroluminescence (EL) display device. When the optical layered body is a circularly polarizing plate, the optical layered body may include a polarizing layer and a 1/4 wavelength plate. It is also possible to have a structure in which each layer is laminated in the order of a four-wave plate or in the order of [ii] a polarizing layer and a quarter-wave plate having a reverse wavelength dispersion.

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

[Measurement of in-plane retardation value]
The first liquid crystal layer-containing layer of the laminate is bonded to glass via an adhesive (Lintec pressure sensitive adhesive 25 μm), and the base layer-containing layer is peeled off to obtain a test piece for measuring a phase difference value. Got The in-plane retardation value of the first liquid crystal layer-containing layer for light having a wavelength of 550 nm was measured using KOBRA-WR manufactured by Oji Scientific Instruments.

[Measurement of displacement in puncture test]
From the first liquid crystal layer-containing layer obtained by peeling the base material layer-containing layer from the laminate, a piece having a length of 30 mm and a width of 30 mm was cut out and used as a test piece for a puncture test. For the piercing test, a small tabletop tester equipped with a piercing jig having a diameter of 1 mm and a radius of curvature of 0.5 R at the tip [Product name “EZ Test” manufactured by Shimadzu Corporation] is used, and the piercing jig passes. For the piercing test, the above piercing jig is pierced onto a test specimen for piercing test sandwiched between two sample stands each having a circular hole with a diameter of 10 mm, which is 0.33 cm/sec. The amount of displacement until the test piece of No. 1 was broken was measured.

[Measurement of adhesion]
An adhesive (pressure sensitive adhesive by Lintec Co., 25 μm) was attached to the first liquid crystal layer-containing layer side of the laminate obtained in the example. A test piece having a width of 25 mm and a length of about 150 mm was cut from the laminate having the pressure-sensitive adhesive layer formed thereon, and the surface of the pressure-sensitive adhesive layer was attached to a glass plate. A peeling tape (width 25 mm x length 180 mm) was attached to one side of 25 mm. Grip one end of the peeling tape using a tensile tester and perform a 180° peel test at a crosshead speed (grabbing movement speed) of 300 mm/min in an atmosphere of a temperature of 23° C. and a relative humidity of 60% to measure the adhesion force. I went.

[Evaluation of optical laminate]
An adhesive is provided on the first liquid crystal layer side of the laminate (width 200 mm x length 250 mm, the orientation direction of the first liquid crystal layer can be any direction with respect to the width direction) obtained in the example. An adhesive (a pressure-sensitive adhesive manufactured by Lintec Co., Ltd., 25 μm) was adhered to each other so that unlaminated regions where no layers were formed were formed at both ends in the width direction with a length in the width direction of 50 mm. A polarizing plate (width 100 mm×length 250 mm) as an optical functional layer was laminated on the pressure-sensitive adhesive layer to obtain an optical laminate with a base layer. The optical layered body obtained by peeling the substrate layer-containing layer along the long side direction from the obtained optical layered body with a substrate layer was observed visually for the shape of the end portion of the first liquid crystal layer, and adhered. The shape that follows the shape of the layer is A, and the shape that does not partly follow the shape of the adhesive layer or has wrinkles is B, and follows the shape of the adhesive layer over the entire length of the edge. The unfixed shape or wrinkle was defined as C.

[Evaluation of workability]
The laminate (width 200 mm×length 250 mm, the orientation direction of the first liquid crystal layer can be any direction with respect to the width direction) obtained in the example, with the base layer-containing layer on top. Then, it was cut in the long-side direction using a super cutter (manufactured by Ogino Seiki Seisakusho Co., Ltd.), 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. If the first liquid crystal layer had only minor cracks or scratches (length 0.5 mm or less) partially, it was designated as A, and cracks or scratches with a length of more than 0.5 μm and 1.0 mm or less were partial. Those that were included were designated as B, and those that had cracks and scratches over the entire length of the first liquid crystal layer were designated as C.

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

・Solvent (95 parts): Cyclopentanone

(Preparation of Composition (A) for Forming Liquid Crystal Layer)
To 100 parts by mass of the polymerizable liquid crystal compound LC242 (manufactured by BASF) shown below, 0.1 part by mass of a leveling agent "BYK-361N" (manufactured by BM Chemie), 2-methyl-1- as a photopolymerization initiator (4-Methylthiophenyl)-2-morpholinopropan-1-one "Irgacure (registered trademark) 907 (Irg907)" (manufactured by BASF Japan Ltd.) 3.0 parts by mass, Laromer (registered trademark) as a reactive additive 2.0 parts by mass of LR-9000 (manufactured by BASF Japan) and 5.0 parts by mass of dipentaerythritol hexaacrylate "NK ester A-DPH" (manufactured by Shin-Nakamura Chemical Co., Ltd.) were added as a crosslinking agent. 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).

(Manufacture of laminated body)
A 100 μm thick polyethylene terephthalate (PET) film as a base material layer was treated with a corona treatment energy of 2.6 mJ/cm ² using a corona treatment device (AGF-B10, manufactured by Kasuga Denki KK). The composition for photo-alignment layer formation (1) was applied to the corona-treated surface by a bar coater, dried at 80° C. for 1 minute, and then polarized UV irradiation device (SPOT CURE SP-7; manufactured by Ushio Inc.). ) Was used to perform polarized UV exposure with an integrated light amount of 100 mJ/cm ² to obtain a photo-alignment layer. The polarized UV was irradiated so that the orientation direction of the photo-alignment layer after exposure was 45°.

Subsequently, the composition (A) for forming a liquid crystal layer was applied on the photo-alignment layer using a bar coater and dried at 120° C. for 1 minute, and then a high pressure mercury lamp (Unicure VB-15201BY-A, Ushio Inc. stock). By irradiating ultraviolet rays (wavelength: 365 nm, integrated light amount at wavelength 365 nm: 1000 mJ/cm ² under a nitrogen atmosphere) using a company) to form a first liquid crystal layer as a retardation layer to form a laminate. Got The thickness of the obtained photo-alignment layer was 100 nm when measured with a laser microscope (LEXT, manufactured by Olympus Corporation). 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, Re(550)=258 nm was obtained.

When the base material layer was peeled off from the obtained laminate, the first liquid crystal layer-containing layer (first liquid crystal layer with photo-alignment layer) was isolated. The fact that only the first liquid crystal layer with the photo-alignment layer was isolated was confirmed by the thickness measurement using the laser microscope. The puncture displacement amount of the obtained first liquid crystal layer-containing layer was measured by the procedure described above and was 1.0 mm. The adhesive force between the base material layer and the first liquid crystal layer-containing layer (first liquid crystal layer with photo-alignment layer) was 0.07 N/25 mm. In addition, when the optical laminate was evaluated by the above-described method, no irregular shape or wrinkle was observed in the shape of the end portion of the first liquid crystal layer, which was a good result. Further, when the workability was evaluated by the above method, cracks and scratches of 1.0 mm or less were partially included. The results are shown in Table 1.

[Example 2]
As described in Table 1, a polymerizable liquid crystal composition was prepared by performing the same operation as in Example 1 except that the reactive additive was not added, and using this, the same procedure as in Example 1 was performed. Then, a laminate was prepared.

When the base material layer was peeled from the obtained laminate, only the first liquid crystal layer was isolated from the base material layer-containing layer (base material layer with photo-alignment layer). The fact that only the first liquid crystal layer was isolated was confirmed by the thickness measurement using the laser microscope. In the same manner as in Example 1, the amount of puncture displacement was measured, and the adhesion between the base layer-containing layer and the first liquid crystal layer was measured, the peeling of the optical laminate was evaluated, and the workability was evaluated. Carried out. The results are shown in Table 1.

[Example 3]
As shown in Table 1, 15 parts by weight of A-DPH as a cross-linking agent was added to the polymerizable liquid crystal compound, and the same operation as in Example 1 was performed except that the reactive additive was not added, and the polymerizable property was obtained. A liquid crystal composition was prepared, and using this, a laminate was prepared in the same procedure as in Example 1.

When the base material layer was peeled from the obtained laminate, only the first liquid crystal layer was isolated from the base material layer-containing layer (base material layer with photo-alignment layer). The fact that only the first liquid crystal layer was isolated was confirmed by the thickness measurement using the laser microscope. In the same manner as in Example 1, the amount of puncture displacement was measured, and the adhesion between the base layer-containing layer and the first liquid crystal layer was measured, the peeling of the optical laminate was evaluated, and the workability was evaluated. Carried out. The results are shown in Table 1.

[Example 4]
As shown in Table 1, 15 parts of trimethylolpropane triacrylate (NK ester A-TMPT (manufactured by Shin-Nakamura Chemical Co., Ltd.)) as a crosslinking agent was added to the polymerizable liquid crystal compound, and a reactive additive was added. The same operation as in Example 1 was carried out except that it was not carried out to prepare a polymerizable liquid crystal composition, which was used to prepare a laminate by the same procedure as in Example 1.

When the base material layer was peeled from the obtained laminate, only the first liquid crystal layer was isolated from the base material layer-containing layer (base material layer with photo-alignment layer). The fact that only the first liquid crystal layer was isolated was confirmed by the thickness measurement using the laser microscope. In the same manner as in Example 1, the amount of puncture displacement was measured, and the adhesion between the base layer-containing layer and the first liquid crystal layer was measured, the peeling of the optical laminate was evaluated, and the workability was evaluated. Carried out. The results are shown in Table 1.

[Example 5]
As shown in Table 1, except that 15 parts of urethane acrylate (UA-122P (manufactured by Shin-Nakamura Chemical Co., Ltd.)) was added as a cross-linking agent to the polymerizable liquid crystal compound and no reactive additive was added. The same operation as in Example 1 was carried out to prepare a polymerizable liquid crystal composition, and this was used to prepare a laminate in the same procedure as in Example 1.

When the base material layer was peeled from the obtained laminate, only the first liquid crystal layer was isolated from the base material layer-containing layer (base material layer with photo-alignment layer). The fact that only the first liquid crystal layer was isolated was confirmed by the thickness measurement using the laser microscope. In the same manner as in Example 1, the amount of puncture displacement was measured, and the adhesion between the base layer-containing layer and the first liquid crystal layer was measured, the peeling of the optical laminate was evaluated, and the workability was evaluated. Carried out. The results are shown in Table 1.

[Example 6]
As shown in Table 1, 15 parts of 1,6-hexanediol diacrylate (NK ester A-HD-N (manufactured by Shin-Nakamura Chemical Co., Ltd.)) as a crosslinking agent was added to the polymerizable liquid crystal compound to react. A polymerizable liquid crystal composition was prepared by performing the same operation as in Example 1 except that the polymerizable additive was not added, and using this, a laminate was prepared in the same procedure as in Example 1.

When the base material layer was peeled from the obtained laminate, only the first liquid crystal layer was isolated from the base material layer-containing layer (base material layer with photo-alignment layer). The fact that only the first liquid crystal layer was isolated was confirmed by the thickness measurement using the laser microscope. In the same manner as in Example 1, the amount of puncture displacement was measured, and the adhesion between the base layer-containing layer and the first liquid crystal layer was measured, the peeling of the optical laminate was evaluated, and the workability was evaluated. Carried out. The results are shown in Table 1.

1a, 1b Laminated body, 2a Laminated body with adhesive layer, 3a, 3c Optical laminated body with base material layer, 4a, 4b Optical laminated body, 10a Base material layer containing layer, 11a Base material layer, 11b Base material layer (base material) 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 non-laminated region, 13ay laminated layer 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 2 Width direction.

Claims (13)

A laminate in which a first liquid crystal layer-containing layer including a first liquid crystal layer is provided on a base material layer-containing layer including a base material layer,
The base material layer-containing layer is peelable from the first liquid crystal layer-containing layer,
The first liquid crystal layer is formed of a composition including a liquid crystal compound and a cross-linking agent (however, the compound is different from the liquid crystal compound), and the liquid crystal compound is horizontal to the surface of the first liquid crystal layer. Is oriented in the direction
In the composition, the content of the crosslinking agent is 3 to 20 parts by mass with respect to 100 parts by mass of the liquid crystal compound,
Displacement amount measured by the following piercing test of the first liquid crystal layer containing layer is 2.0mm or less, the laminate.
[Measurement of displacement in puncture test]
A piece having a length of 30 mm and a width of 30 mm is 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 puncture test. For the piercing test, a small tabletop tester equipped with a piercing jig having a diameter of 1 mm and a radius of curvature of 0.5 R at the tip [Product name “EZ Test” manufactured by Shimadzu Corporation] is used, and the piercing jig passes. The piercing jig is pierced on a test piece for piercing test sandwiched between two sample stands with circular holes of 10 mm in diameter that can be pierced at 0.33 cm/sec. The amount of displacement until the test piece of No. 1 is broken is measured. The laminate according to claim 1, wherein the adhesive force between the base layer-containing layer and the first liquid crystal layer-containing layer is 0.05 N/25 mm or more. The base material layer-containing layer further includes an alignment layer,
The laminate according to claim 1, wherein the first liquid crystal layer-containing layer is provided on the alignment layer side of the base material layer-containing layer. The first liquid crystal layer-containing layer further includes an alignment layer,
The laminate according to claim 1, wherein the base material layer-containing layer is provided on the alignment layer side 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 first liquid crystal layer-containing layer side of the laminate,
The first liquid crystal layer-containing layer is a laminated body with an adhesive layer, which has an unlaminated region in which the adhesive layer is not laminated. The laminate with an adhesive layer according to claim 5, wherein the non-laminated region is present in at least one end portion in the width direction of the laminate with an adhesive layer. An optical layered body with a substrate layer, comprising the layered body 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, which is provided on the first liquid crystal layer-containing layer side of the laminate. An optical layered body with a substrate layer, wherein an optical functional layer is provided on the adhesive layer of the layered body with an adhesive layer according to claim 5 or 6. The optical layered body with a substrate layer according to claim 7, wherein the optical functional layer includes a polarizing layer. The optical layered body with a substrate 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, a crosslinking agent (provided that the a compound different from the liquid crystal compound.) And the formed from including the composition, the liquid crystal compound is the first' liquid crystal layer It is oriented horizontally to the plane,
In the composition, the content of the crosslinking agent is 3 to 20 parts by mass with respect to 100 parts by mass of the liquid crystal compound,
The first 'displacement amount measured by the following piercing test of the liquid crystal layer containing layer is 2.0mm or less, the optical stack.
[Measurement of displacement in puncture test]
A 30 mm long×30 mm wide piece is cut out from the first' liquid crystal layer-containing layer to obtain a test piece for a puncture test. For the piercing test, a small tabletop tester equipped with a piercing jig having a diameter of 1 mm and a radius of curvature of 0.5 R at the tip [Product name “EZ Test” manufactured by Shimadzu Corporation] is used, and the piercing jig passes. The piercing jig is pierced on a test piece for piercing test sandwiched between two sample stands with circular holes of 10 mm in diameter that can be pierced at 0.33 cm/sec. The amount of displacement until the test piece of No. 1 is broken is measured. The first' liquid crystal layer-containing layer further includes an alignment layer,
The optical layered body according to claim 11, wherein the alignment layer is provided on the opposite side of the first' liquid crystal layer from the adhesive layer. A method for producing an optical layered body including 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 manufacturing method of an optical laminated body including the process of peeling the said base material layer containing layer from the optical laminated body with a base material layer of any one of Claims 7-10.

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