JPWO2018016549A1 - Patterned optically anisotropic layer and optical laminate - Google Patents

Abstract

Provided are an optically anisotropic layer and an optical laminate capable of suppressing shortening of a selective reflection wavelength when a CL liquid crystal layer is observed from an oblique direction. The patterned optically anisotropic layer is formed using a composition containing a liquid crystalline compound, and a first region on which an oriented liquid crystalline compound is immobilized, and a second region which is optically isotropic. And the width of at least one of the first region and the second region is less than 50 μm.

Description

  The present invention relates to a patterned optically anisotropic layer and an optical laminate.

  A layer formed by fixing a cholesteric liquid crystal phase (hereinafter also referred to as "CL liquid crystal layer") is a layer having a property of selectively reflecting any one of right circularly polarized light and left circularly polarized light in a specific wavelength range. It is known (patent document 1).

JP 2005-49866 A

  When the CL liquid crystal layer is observed from an oblique direction, the selective reflection wavelength shifts to the short wavelength side. On the other hand, in view of application to various applications, it is preferable that such a shift of the selective reflection wavelength (so-called "blue shift") be suppressed.

An object of the present invention is to provide an optically anisotropic layer capable of suppressing shortening of a selective reflection wavelength when a CL liquid crystal layer is observed from an oblique direction in view of the above-mentioned situation.
Another object of the present invention is to provide an optical laminate.

  The inventors of the present invention conducted intensive studies on the above problems, and found that the problems can be solved by the following configuration.

(1) A patterned optically anisotropic layer formed by using a composition containing a liquid crystal compound,
The patterned optically anisotropic layer has a first region on which an oriented liquid crystalline compound is immobilized, and a second region which is optically isotropic,
A patterned optically anisotropic layer, wherein the width of at least one of the first region and the second region is less than 50 μm.
(2) The patterned optically anisotropic layer according to (1), wherein the width of at least one of the first region and the second region is 30 μm or less.
(3) The patterned optically anisotropic layer according to (1) or (2), wherein the first region and the second region are alternately arranged in a stripe shape.
(4) The patterned optically anisotropic layer according to (1) or (2), wherein one of the first region and the second region is dot-like.
(5) The patterned optical according to any one of (1) to (4), wherein the first region is a region formed by fixing a liquid crystal compound twisted and oriented along a helical axis extending along the thickness direction. Anisotropic layer.
(6) a support,
An alignment film disposed on a support;
The optical laminated body which has a patterned optically anisotropic layer in any one of (1)-(5) arrange | positioned on alignment film.

According to the present invention, it is possible to provide an optically anisotropic layer capable of suppressing shortening of the selective reflection wavelength when the CL liquid crystal layer is observed from an oblique direction.
Furthermore, according to the present invention, an optical laminate can also be provided.

It is a perspective view showing an example of an optical layered product. It is a perspective view for demonstrating the 1st area | region in a patterning optically anisotropic layer. It is a figure for demonstrating the manufacturing process of a patterning optically anisotropic layer. It is a figure for demonstrating the manufacturing process of a patterning optically anisotropic layer. It is a figure for demonstrating the manufacturing process of a patterning optically anisotropic layer. It is a conceptual diagram regarding the boundary area of a patterned optically anisotropic layer. It is a top view of the other form of a patterned optically anisotropic layer. It is a top view of the other form of a patterned optically anisotropic layer. It is a top view of the other form of a patterned optically anisotropic layer. It is a polarization | polarized-light transmission image which shows the patterning optically anisotropic layer of an Example. It is a polarization | polarized-light transmission image which shows the patterning optically anisotropic layer of a comparative example.

Hereinafter, the patterned optically anisotropic layer and the optical laminate of the present invention will be described in detail.
In addition, the numerical range represented using "-" in this specification means the range which includes the numerical value described before and after "-" as a lower limit and an upper limit.
Moreover, in the present specification, the terms "orthogonal" and "parallel" include the range of allowable errors in the technical field to which the present invention belongs. For example, “orthogonal” and “parallel” mean within ± 10 ° of exact orthogonal or parallel, and an error of less than 5 ° with respect to exact orthogonal or parallel It is preferable that the angle be 3 degrees or less.
In addition, specific angles such as 15 ° or 45 ° other than “orthogonal” and “parallel” are also included in the range of allowable errors in the technical field to which the present invention belongs. For example, the angle means less than ± 5 ° for the specifically indicated exact angle, and the error for the indicated exact angle is preferably ± 3 ° or less, ± More preferably, it is 1 ° or less.

  Re (λ) represents the in-plane retardation at the wavelength λ. Rth (λ) represents the retardation in the thickness direction at the wavelength λ. Re (λ) and Rth (λ) are measured by making light of wavelength λ nm incident in the film normal direction in Axometry (manufactured by Axometric). Alternatively, it can be measured also by the Senalmon method using a polarization microscope and a λ / 4 plate. In the present specification, the measurement wavelength is 550 nm unless otherwise specified.

When the patterned optically anisotropic layer of the present invention is disposed on the CL liquid crystal layer and observed from the side of the patterned optically anisotropic layer, the selective reflection wavelength observed in the normal direction of the CL liquid crystal layer is There is not much difference between the selective reflection wavelength observed in the oblique direction inclined from the normal direction of the CL liquid crystal layer, and the blue shift is suppressed.
Although the details of the reason why the above effect can be obtained are unknown, the width of at least one of the first region which is a region formed by fixing the aligned liquid crystal compound and the second region showing optical isotropy is less than 50 μm By narrowing, a phenomenon of intensification occurs between light reflected from the CL liquid crystal layer, and it is presumed that the above effect is obtained as a result.

Hereinafter, the patterned optically anisotropic layer and the optical laminate will be described in detail with reference to the drawings.
FIG. 1 is a perspective view showing an embodiment of the optical laminate of the present invention. The figures in the present invention are schematic views, and the relationship of thickness of each layer, positional relationship and the like do not necessarily coincide with the actual ones. The same is true for the following figures.
An optical laminate 10 shown in FIG. 1 includes a support 12, an alignment film 14 disposed on the support 12, and a patterned optically anisotropic layer 16a disposed on the alignment film 14 in this order. Have. In the patterned optically anisotropic layer 16a, the first regions 18a and the second regions 20a are alternately arranged in stripes.
Hereinafter, each member which comprises the optical laminated body 10 is explained in full detail.

<Support>
The type of the support 12 is not particularly limited as long as the support 12 is a plate that supports the patterned optically anisotropic layer 16 a. The support 12 may be rigid or flexible, and is preferably flexible in terms of easy handling.
As a rigid support, a glass plate (for example, a soda glass plate having a silicon oxide film on the surface, a low expansion glass, a non-alkali glass, and a quartz glass plate), a metal plate (for example, an aluminum plate, an iron plate, and the like) , SUS (Steel Use Stainless) plate, etc.), ceramic plate, and stone plate.
Flexible supports include cellulose esters (eg, cellulose acetate, cellulose propionate, cellulose butyrate), polyolefins (eg, norbornene polymers), poly (meth) acrylates (eg, polymethyl methacrylate), polycarbonates And plastic films composed of polyester (eg, polyethylene terephthalate or polyethylene naphthalate) or polysulfone, paper, and cloth.
The thickness of the support 12 is not particularly limited, but is preferably about 1 to 3000 μm.

<Alignment film>
The alignment film 14 may be any layer as long as it can impart the alignment property to the patterned optically anisotropic layer 16 a. As the alignment film 14, a layer of an organic compound (preferably a polymer) subjected to rubbing treatment, a photo alignment film which expresses the alignment property of a liquid crystal compound by irradiation of polarized light represented by azobenzene polymer or polyvinyl cinnamate, inorganic compound And a layer having microgrooves, and a cumulative film formed by the Langmuir-Blodgett method (LB method).
Among them, the alignment film 14 is preferably an alignment film containing polyvinyl alcohol, and more preferably capable of being crosslinked with a layer disposed on at least one of the upper side and the lower side of the alignment film. More specifically, examples of alignment films include those described in JP-A-2009-69793, JP-A-2010-113249, and JP-A-2011-203636.
In addition, when the photo alignment film is used, generation of alignment defects due to minute foreign substances can be suppressed.

<Patterned optically anisotropic layer>
In the patterned optically anisotropic layer 16a, the first regions 18a and the second regions 20a are alternately arranged in stripes. More specifically, each of the first region 18a and the second region 20a has an elongated shape extending in one direction, and along the direction orthogonal to the one direction, the first region 18a and the second region 20a extend in the one direction. The second regions 20a are alternately arranged.

The width W1 of the first region 18a and the width W2 of the second region 20a are both less than 50 μm. Among them, the width W1 and the width W2 are preferably 30 μm or less, and more preferably 10 μm or less in that the effects of the present invention are more excellent.
Although the aspect in which the width of both the first area 18 a and the second area 20 a is less than 50 μm has been described above, the width of one area may be less than 50 μm in the present invention. Moreover, the preferable range of the width | variety of one area | region is the same as the preferable range of the said width W1 and the width W2.

The first region 18 a is a region formed by fixing a liquid crystal compound twisted and oriented along a helical axis extending along the thickness direction. Among them, as described later, it is preferable that the region is obtained by curing the polymerizable liquid crystal compound in a predetermined twisted alignment state and then curing by heating or radiation.
The liquid crystal compound being twisted and oriented means that the liquid crystal compound from one surface to the other surface is twisted with the thickness direction of the first region 18a as an axis (helical axis). Along with that, the alignment direction (in-plane slow axis direction) of the liquid crystal compound differs depending on the position in the thickness direction. More specifically, the first region 18a preferably exhibits a so-called helical nematic phase having a helical structure, a cholesteric phase or the like. When the first region 18a is formed, it is preferable to use a composition containing a liquid crystal compound exhibiting a nematic liquid crystal phase and a chiral agent.

  Note that the state in which the liquid crystal compound in which the twist alignment is made is “fixed” is a state in which the alignment of the liquid crystal compound is maintained. More specifically, the state in which the liquid crystal compound in a twisted orientation is "fixed" usually has no fluidity in the temperature range of 0 ° C to 50 ° C and more severe conditions of -30 ° C to 70 ° C. Further, it is preferable that the fixed orientation form can be kept stable without causing a change in the orientation form by an external field or an external force.

The positional relationship of the in-plane slow axis in the first region 18a will be described in detail with reference to FIG. The black arrows in FIG. 2 are intended for the in-plane slow axis. Further, in FIG. 2, the lower side in the drawing corresponds to the alignment film 14 side.
The twisting direction of the liquid crystal compound may be right twist or left twist.
The twist angle of the liquid crystal compound is not particularly limited, but is preferably 360 ° or less, more preferably 20 to 200 °, and still more preferably 50 to 100 °, in that the effect of the present invention is more excellent. The twist angle corresponds to an angle θ between the in-plane slow axis on one surface in the first region 18 a in FIG. 2 and the in-plane slow axis on the other surface.
The twist angle of the liquid crystal compound in the first region 18a can be adjusted, for example, by the type of chiral agent or the concentration thereof.

  The second region 20a is optically isotropic. In the optical isotropy, the in-plane retardation of the second region 20a at a wavelength of 550 nm is 10 nm or less, and the absolute value of the retardation in the thickness direction of a wavelength of 550 nm is 10 nm or less. Intended.

  The thickness of the patterned optically anisotropic layer 16 a is not particularly limited, but is preferably 0.5 to 10 μm and more preferably 1 to 5 μm from the viewpoint that the effect of the present invention is more excellent.

  The patterned optically anisotropic layer 16a is formed using a composition containing a liquid crystal compound. The method for producing the patterned optically anisotropic layer 16a will be described in detail later, but the first region 18a and the second region 20a of the patterned optically anisotropic layer are both formed of a composition containing a liquid crystal compound. .

  The type of liquid crystal compound used for forming the patterned optically anisotropic layer 16a is not particularly limited. Liquid crystal compounds can be generally classified into rod-like types (rod-like liquid crystalline compounds) and disk-like types (disk-like liquid crystalline compounds and discotic liquid crystalline compounds) according to their shapes. Furthermore, there are low molecular type and high molecular type, respectively. In general, a polymer refers to one having a degree of polymerization of 100 or more (Polymer physics / phase transition dynamics, Masao Doi, page 2, Iwanami Shoten, 1992). Any liquid crystal compound can also be used in the present invention. Also, two or more rod-like liquid crystalline compounds, two or more discotic liquid crystalline compounds, or a mixture of a rod-like liquid crystalline compound and a discotic liquid crystalline compound may be used.

The patterned optically anisotropic layer 16 a can reduce change in optical characteristics due to temperature and / or humidity, and thus, using a liquid crystal compound (a rod-like liquid crystal compound or a discotic liquid crystal compound) having a polymerizable group It is preferable to form. That is, the patterned optically anisotropic layer 16 a is preferably a layer formed by fixing a liquid crystal compound having a polymerizable group by polymerization.
The type of polymerizable group contained in the liquid crystal compound is not particularly limited, and examples thereof include a radically polymerizable group and a cationically polymerizable group. Examples of the radically polymerizable group include a (meth) acryloyl group and a styryl group, and examples of the cationically polymerizable group include an oxetane group, an epoxy group, and a vinyl ether group.
The liquid crystal compound may have two or more different polymerizable groups, and may have, for example, both a radically polymerizable group and a cationically polymerizable group.
The “(meth) acryloyl group” is a notation representing both an acryloyl group and a methacryloyl group.

  The content of the liquid crystal compound in the composition is not particularly limited, but it is preferably 80 to 99.9% by mass, and 85 to 99.5% by mass with respect to the solid content mass (mass excluding the solvent) of the liquid crystal composition. % Is more preferable.

The composition preferably contains a chiral agent.
The type of chiral agent is not particularly limited, and known compounds (for example, liquid crystal device handbook, Chapter 3-4-3, TN, chiral agents for STN, page 199, edited by 142th Committee of Japan Society for the Promotion of Science, 1989) Described). Specific examples include isosorbide and isomannide derivatives.
The chiral agent may also be a compound exhibiting liquid crystallinity.
The content of the chiral agent in the composition is not particularly limited, but is preferably 0.01 to 200 mol%, more preferably 1 to 30 mol%, based on the total mass of the liquid crystal compound (particularly, polymerizable liquid crystal compound). preferable.

  The above composition further includes other components (for example, a polymerization initiator, a solvent, a surfactant, an orientation control agent, a polymerization inhibitor, an antioxidant, an ultraviolet light absorber, and a light stabilizer). May be included.

The formation method of a patterned optically anisotropic layer is not specifically limited, A well-known method is employable. Especially, the formation method which has the following processes 1-6 is preferable at the point which productivity is excellent.
Step 1: A composition including a liquid crystal compound having two different types of polymerizable groups, a chiral agent, and a polymerization initiator X that initiates the polymerization of one of the two types of the above-described two groups is on the alignment film 14 Of forming a coating film on the coating film: Step of aligning the liquid crystalline compound in the coating film Step 3: The coating film obtained in Step 2 is irradiated with radiation or heat treatment to form a polymerization initiator Step 4 of activating X and advancing a polymerization reaction in which one of the two polymerizable groups of the liquid crystal compound can react: Step 4: On the coated film obtained in Step 3, the above two types of polymerizability Step 5 of applying a composition containing a polymerization initiator Y which initiates the polymerization of the other of the groups Step 5: The polymerization initiator Y is activated by pattern exposure or pattern heating, and the two polymerizabilities of the liquid crystal compound Proceed with the polymerization reaction in which the other of the groups can react Step Step 6: By heating process alters the unexposed areas isotropic region optically hereinafter be described in detail the procedure of Step 1-6.

(Step 1)
Step 1 includes a liquid crystal compound having two different types of polymerizable groups, a chiral agent, and a composition including a polymerization initiator X that initiates polymerization of one of the two types of polymerizable groups. It is a process which apply | coats on and forms a coating film. By carrying out this step, as shown in FIG. 3, a laminate having the support 12, the alignment film 14 and the coating 22 is formed.
The definitions of the liquid crystal compound and the chiral agent are as described above. In addition, as different 2 types of polymeric groups, the combination of a radically polymerizable group and a cationically polymerizable group is preferable.
The polymerization initiator X that initiates the polymerization of one of the two polymerizable groups may be any compound that can initiate the polymerization reaction of the polymerizable group, for example, a radical that initiates the polymerization of the radical polymerizable group A polymerization initiator and a cationic polymerization initiator which initiates polymerization of a cationically polymerizable group can be mentioned.
In addition, the other component mentioned above may be contained in the composition.

  The method for applying the above composition is not particularly limited, and dip coating method, air knife coating method, spin coating method, slit coating method, curtain coating method, roller coating method, wire bar coating method, gravure coating method, etc. It can be mentioned.

(Step 2)
Step 2 is a step of aligning the liquid crystal compound in the coating film. By carrying out this step, the liquid crystal compound is in a predetermined alignment state in the coating film. More specifically, the liquid crystal compound is in a twisted and oriented state along the helical axis extending along the thickness direction.
Examples of the treatment for orienting the liquid crystal compound include heat treatment. The heating conditions are optimally selected according to the type and amount of the liquid crystal compound and chiral agent used, but the heating temperature is preferably 40 to 100 ° C., and the heating time is 0.5 to 5 minutes. preferable.

(Step 3)
Step 3 activates the polymerization initiator X to the coating film obtained in step 2 by irradiation or heat treatment, so that one of the two polymerizable groups of the liquid crystal compound may react. It is a step of advancing the reaction. By carrying out this step, one of the two polymerizable groups is reacted to obtain a semi-cured coating film in which the liquid crystal compound is maintained in the aligned state.
Radiation means electromagnetic waves such as radio waves, light (infrared light, visible light, and ultraviolet light), X-rays, and gamma rays, as well as electron beams (beta rays), proton beams, neutron beams, alpha rays, Also, it is a generic term for particle beams such as ion beams.
As a process which activates the polymerization initiator X, radiation irradiation is preferable and ultraviolet irradiation is more preferable. The irradiation energy is preferably from ^{5mJ / cm 2 ~1J / cm 2} , 10~800mJ / cm 2 is more preferable.

(Step 4)
Step 4 is a step of applying a composition containing a polymerization initiator Y for initiating polymerization of the other of the above two types of polymerizable groups onto the coating film obtained in step 3. By carrying out this step, the polymerization initiator Y in the composition applied on the semi-cured coating film obtained in step 3 penetrates into the coating film, and the polymerization initiator Y in the coating film Can be supplied.
The polymerization initiator Y may be any compound that initiates the polymerization of the other of the two types of polymerizable groups, for example, a radical polymerization initiator that initiates the polymerization of a radically polymerizable group, and a cationically polymerizable group The cationic polymerization initiator which starts superposition | polymerization is mentioned.

  The composition used in Step 4 may contain components other than the polymerization initiator Y. For example, the composition may contain other components that the composition used in step 1 above may contain.

(Step 5)
In step 5, pattern exposure or pattern heating is applied to the laminate obtained in step 4 to activate the polymerization initiator Y, and the other of the two polymerizable groups of the liquid crystal compound is reacted. It is a process to advance a possible polymerization reaction. Although FIG. 4 shows an aspect of pattern exposure, by carrying out this step, the polymerization reaction further proceeds in the exposed area, and the alignment state of the liquid crystal compound is fixed. That is, the exposure unit becomes the above-described first region 18a.

As a method of pattern exposure, a method of performing contact exposure, proxy exposure, projection exposure and the like using a mask may be used, or focusing may be performed directly on a predetermined position without using a laser or an electron beam, etc. May be used.
At the time of pattern exposure, exposure is performed in the form of stripes so as to obtain the first region 18a shown in FIG. In addition, in order to obtain the aspect of FIG. 1, the widths of the elongated exposed portion and the elongated unexposed portion are respectively adjusted to be less than 50 μm.
The wavelength of the light at the time of pattern exposure should just be a wavelength which the polymerization initiator Y activates, for example, an ultraviolet-ray is mentioned. The irradiation energy and irradiation time at the time of pattern exposure are optimally selected depending on the type of liquid crystal compound and polymerization initiator Y used.

  As a method of pattern heating, a contact heating method using a heated patterning plate and a heating method using an infrared laser can be mentioned.

(Step 6)
Step 6 is a step of changing the unexposed area into an optically isotropic area by heating the coating film obtained in step 5. By carrying out this step, the entire coating film is heated, the orientation of the liquid crystal compound is disturbed in the unexposed region in step 5, and the unexposed region is optically isotropic as shown in FIG. It becomes the 2nd field 20a which shows. In the exposure region in Step 5, as described above, since the polymerization reaction by two kinds of polymerization reactions proceed, the alignment state of the liquid crystal compound is hardly disturbed even by the heat treatment, and the predetermined optical characteristics The indicated area is maintained. That is, by carrying out the present step 6, as shown in FIG. 5, a predetermined patterned optically anisotropic layer 16a is formed.
The conditions for the heat treatment are not particularly limited, and optimal conditions are selected depending on the type of liquid crystal compound to be used. When the temperature at which the optical characteristics of the unexposed area disappear is T1 [° C] and the temperature at which the optical characteristics of the exposed area disappear is T2 [° C], the temperature during heating is preferably T1 ° C to T2 ° C, (T1 + 10) ° C. or more (T2-5) ° C. or less is more preferable, and (T1 + 20) ° C. or more is more preferable (T2-10) ° C. or less.
In addition, as heating temperature, 50-400 degreeC is preferable.

  In the patterned optically anisotropic layer 16a manufactured according to the above procedure, as shown in FIG. 6, the width of the boundary area 24 between the first area 18a and the second area 20a can be narrowed. The width of the boundary region 24 depends on the degree of optical bleeding of pattern exposure, and is preferably 1 μm or less, more preferably 0.7 μm or less, and still more preferably 0. In addition, with the boundary area | region 24, the area | region which changes to the optical isotropy of 2nd area | region 20a from the optical characteristic of 1st area | region 18a is intended.

The optical laminate 10 may have other layers other than the support 12, the alignment film 14, and the patterned optically anisotropic layer 16 a described above. As other layers, for example, hard coat layer, adhesive layer / adhesive layer (Adhesive), optically anisotropic layer (retardation layer), gas barrier layer, antiglare layer, antistatic layer, antifouling layer, releasing layer , An easily adhesive layer, and a moisture-proof layer.
The surface of the patterned optically anisotropic layer may be subjected to corona treatment or plasma treatment to control adhesion to another layer or wettability to a liquid.

<Other aspects>
In the patterned optically anisotropic layer 16a of FIG. 1 described above, the first region 18a and the second region 20a are arranged in a stripe shape, but the present invention is not limited to this aspect.
For example, as in the patterned optically anisotropic layer 16b shown in FIG. 7, the first regions 18b may be arranged in a circular dot shape, and the other regions may constitute the second region 20b. . The first region 18a and the first region 18b, and the second region 20a and the second region 20b have the same optical characteristics except that the shape of the region is different.
Moreover, as a method of forming the patterned optically anisotropic layer 16b as shown in FIG. 7, the method of changing the shape of the mask in the process 5 mentioned above is mentioned.
As shown in FIG. 7, in the patterned optically anisotropic layer 16b, the diameter D of the first region 18b may be less than 50 μm. The preferred range of the diameter D is the same as the preferred range of W1.

In FIG. 7, the first region 18b of the patterned optically anisotropic layer 16b has a circular shape, but may have a dot shape. For example, as shown in FIG. 8, the first region 18c has a square shape. And the other region may constitute the second region 20c. The first region 18a and the first region 18c, and the second region 20a and the second region 20c have the same optical characteristics except that the shape of the region is different.
Moreover, as a method of forming the patterned optically anisotropic layer 16c as shown in FIG. 8, the method of changing the shape of the mask in the process 5 mentioned above is mentioned.
As shown in FIG. 8, in the patterned optically anisotropic layer 16c, the length of one side of the first region 18c may be less than 50 μm. The preferred range of the side length is the same as the preferred range of W1.

When the first region is arranged in a dot shape, the first region may have a shape other than the circular shape and the square shape, and examples thereof include an elliptical shape, a rectangular shape, and a polygonal shape.
When the first area is in the form of dots, the minimum length of the dots can be mentioned as the width of the first area.

  In the embodiment of FIG. 1 described above, 360 ° or less is preferable with respect to the twist angle of the liquid crystal compound, but the embodiment is not limited to this embodiment, and the twist angle may be more than 360 °. The region may be in the state of a cholesteric liquid crystal phase having a pitch number. In addition, when a 1st area | region is an area | region formed by fixing a cholesteric liquid crystal phase, it is preferable that a 1st area | region reflects the light of a visible light (400-700 nm) area | region from the point of development to various uses.

Furthermore, in the patterned optically anisotropic layer 16a of FIG. 1 described above, the first region 18a is a region formed by fixing a liquid crystal compound twisted and oriented along a helical axis extending along the thickness direction. The invention is not limited to this aspect. For example, as shown in FIG. 9, a patterned optical structure having a first region 18d in which the slow axes of the liquid crystal compound are parallel to each other over the entire thickness direction and a second region 20d exhibiting optical isotropy It may be the anisotropic layer 16d. The first region 18d is a region showing so-called optical anisotropy, and as shown in FIG. 9, has a slow axis in one direction.
The range of the in-plane retardation of the first region 18d at a wavelength of 550 nm is not particularly limited, but is preferably 100 to 300 nm, and more preferably 100 to 160 nm or 250 to 300 nm from the viewpoint of application to various applications.
As a method of forming the patterned optically anisotropic layer 16d as shown in FIG. 9, a method using a composition obtained by removing the chiral agent from the composition used in the above-mentioned step 1 may be mentioned.

  In the above embodiment, although the embodiment of the optical laminate having the support, the alignment film, and the patterned optically anisotropic layer is described, it is patterned by using the releasable support or the releasable alignment film. The optically anisotropic layer may be transferred to another member for use.

<Use>
By arranging the optical laminate on the CL liquid crystal layer, the selective reflection wavelength observed in the normal direction of the CL liquid crystal layer and the selective reflection observed in the oblique direction tilted from the normal direction of the CL liquid crystal layer The difference between the wavelength can be reduced.
In addition to the above applications, for example, the present invention can be applied to applications such as a retardation plate placed in front of a sensor for detecting polarized light, a depolarizing film, and a brightness enhancement film.

  Hereinafter, the present invention will be described in more detail based on examples.

(Preparation of Composition A for Alignment Film)
The components shown below were mixed in a container kept at 80 ° C. to prepare a composition A for alignment film.
-----------------------
Composition A for Alignment Film
-----------------------
Pure water: 97.2 parts by mass PVA-205 (manufactured by Kuraray): 2.8 parts by mass---------------------

(Preparation of Composition B for Alignment Film)
In a reaction vessel equipped with a stirrer, a thermometer, a dropping funnel and a reflux condenser, 100 parts by mass of 2- (3,4-epoxycyclohexyl) ethyltrimethoxysilane, 500 parts by mass of methyl isobutyl ketone, and 10 parts by mass of triethylamine Were mixed and mixed at room temperature.
Next, 100 parts by mass of deionized water was added dropwise to the solution in the reaction vessel over 30 minutes from the dropping funnel, and then the obtained solution was reacted at 80 ° C. for 6 hours while mixing under reflux. After completion of the reaction, the organic phase was removed from the solution, and the organic phase was washed with a 0.2% by mass aqueous ammonium nitrate solution until the water after neutralization became neutral. Thereafter, the solvent and water were distilled off under reduced pressure to obtain an epoxy group-containing polyorganosiloxane as a viscous transparent liquid.
The epoxy group-containing polyorganosiloxane was subjected to ¹ H-NMR (Nuclear Magnetic Resonance) analysis, and a peak based on the oxiranyl group was obtained around the chemical shift (δ) = 3.2 ppm according to theoretical strength, during the reaction It was confirmed that no side reaction of epoxy group occurred. The epoxy group-containing polyorganosiloxane had a weight average molecular weight Mw of 2,200 and an epoxy equivalent of 186 g / mol.
Next, in a 100 mL three-necked flask, 10.1 parts by mass of the epoxy group-containing polyorganosiloxane obtained above, an acrylic group-containing carboxylic acid (Toagosei Co., Ltd., trade name "ALONIX M-5300", acrylic acid ω-carboxy 0.5 parts by mass of polycaprolactone (degree of polymerization n ≒ 2), 20 parts by mass of butyl acetate, 1.5 parts by mass of a cinnamic acid derivative obtained by the method of Synthesis Example 1 of JP-A-2015-26050, 0.3 parts by mass of tetrabutylammonium bromide was charged, and the resulting reaction solution was stirred at 90 ° C. for 12 hours.
After completion of the reaction, the reaction solution was diluted with an equal amount (mass) of butyl acetate, and washed three times with water.
The obtained solution was concentrated, and the operation of diluting with butyl acetate was repeated twice to finally obtain a solution containing a polyorganosiloxane (polymer) having a photoalignable group. The weight average molecular weight Mw of this polymer was 9,000. Moreover, the component which has a cinnamate group in a polymer was 23.7 mass% as a result of ¹ H-NMR analysis.

A composition B for alignment film was prepared by mixing butyl acetate, the previously synthesized polyorganosiloxane having a photoalignable group, and the following compound D1 and compound D2 in the following amounts.
------------------------
Composition B for Alignment Film
------------------------
Butyl acetate: 100 parts by mass Polyorganosiloxane having photoalignable group: 4.35 parts by mass Compound D 1: 0.48 parts by mass Compound D 2: 15. 15 parts by mass---------- --------------

(Preparation of Composition LC-1 for Optically Anisotropic Layer)
The following components were mixed, and the obtained mixture was filtered with a polypropylene filter having a pore size of 0.2 μm to obtain a composition LC-1 for an optically anisotropic layer.
The rod-like liquid crystalline compound (LC-1-1) was synthesized according to the method described in JP-A-2004-12382. The rod-like liquid crystalline compound (LC-1-1) is a liquid crystalline compound having two polymerizable groups, one of the two polymerizable groups is an acrylic group which is a radical polymerizable group, and the other is a cationic polymerizable group. It is an oxetane group. Horizontal alignment agents (LC-1-2) are described in Tetrahedron Lett. 43, p. 6793 (202).
---------------------------
Composition LC-1 for optically anisotropic layer
---------------------------
Rod-like liquid crystalline compound (LC-1-1): 19.57 parts by mass Horizontal alignment agent (LC-1-2): 0.01 parts by mass Cationic monomer (OXT-121, manufactured by Toagosei Co., Ltd.): 0 .98 parts by mass cationic polymerization initiator (Curacure UVI 6974, manufactured by Dow Chemical): 0.4 parts by mass Polymerization control agent (IRGANOX 1076, manufactured by BASF): 0.02 parts by mass Methyl ethyl ketone: 80.0 parts by mass----- -----------------------

(Preparation of Composition LC-2 for Optically Anisotropic Layer)
A composition LC-2 for an optically anisotropic layer was prepared using the following materials in the same manner as the composition LC-1 for an optically anisotropic layer.
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Composition LC-2 for optically anisotropic layer
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Rod-like liquid crystal compound (LC-1-1): 19.57 parts by mass Horizontal alignment agent (LC-1-2): 0.01 parts by mass Chiral agent of the following structure: 0.587 parts by mass Cationic monomer (OXT- 121, Toagosei Co., Ltd. product: 0.98 parts by mass Cationic polymerization initiator (Curacure UVI 6974, manufactured by Dow Chemical): 0.4 parts by mass Polymerization control agent (IRGANOX 1076, manufactured by BASF): 0.02 parts by mass methyl ethyl ketone : 80.0 parts by mass---------------------------

Chiral agent

(Preparation of Composition LC-3 for Optically Anisotropic Layer)
The composition LC-3 for optically anisotropic layer is prepared using the same method and material as the composition LC-2 for optically anisotropic layer, changing the amount of the chiral material to be added to 1.10 parts by mass. Prepared.

(Preparation of Composition LC-4 for Optically Anisotropic Layer)
Using the same method and material as the composition LC-2 for the optically anisotropic layer, changing the amount of the chiral material to be added to 1.37 parts by mass, the composition LC-4 for the optically anisotropic layer Prepared.

(Preparation of Composition LC-5 for Optically Anisotropic Layer)
The composition LC-5 for the optically anisotropic layer is prepared using the same method and material as the composition LC-2 for optically anisotropic layer, changing the amount of the chiral material to be added to 0.035 parts by mass. Prepared

(Preparation of Protective Layer Composition AD-1)
The following components were mixed, and the obtained mixture was filtered through a polypropylene filter having a pore size of 0.2 μm to obtain a protective layer composition AD-1.
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Protective layer composition AD-1
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Benzyl methacrylate / methacrylic acid / methyl methacrylate = 35.9 / 22.4 / 41.7 molar ratio random copolymer (weight average molecular weight 38,000): 8.05
Radical polymerization initiator (2-trichloromethyl-5- (p-styristyl) 1,3,4-oxadiazole): 0.12 parts by mass hydroquinone monomethyl ether: 0.002 parts by mass Megafac F-176 PF (large Nippon Ink Chemical Industry Co., Ltd .: 0.05 parts by mass Propylene glycol monomethyl ether acetate: 34.80 parts by mass Methyl ethyl ketone: 50.538 parts by mass Methanol: 1.61 parts by mass-------- --------------------

Example 1
Composition B for alignment film was uniformly coated on a glass substrate using a slit coater. Thereafter, the glass substrate coated with the composition B for alignment film was dried for 2 minutes in an oven at 100 ° C. to obtain a glass substrate with a film thickness of 0.5 μm. Next, a wire grid polarizing plate is disposed on the coating film so that the polarization axis is parallel to the coating direction, and under the conditions of 25 ° C., under the atmosphere, PLA-501F exposure machine manufactured by Canon Inc. The coating film was irradiated with ultraviolet light of 30 mJ / cm ² to obtain an alignment film.
Next, the composition LC-5 for optically anisotropic layer was applied on the alignment film. Next, the obtained coating film is aged by heating at a film surface temperature of 80 ° C. for 60 seconds to orient the liquid crystal compound, and immediately thereafter, an air-cooled metal halide lamp (eye graphic with a film surface temperature of 70 ° C.) The coating film was irradiated with ultraviolet light at 500 mJ / cm ² using Co., Ltd.) to promote cationic polymerization.
The protective layer composition AD-1 was applied onto the resulting coated film, and dried at 80 ° C. for 60 seconds. After that, under a condition of 25 ° C., under a condition of using a PLA-501F exposure apparatus (super high pressure mercury lamp) manufactured by Canon Inc. under air at a dose of 50 mJ / cm ² through a predetermined mask, a protective layer composition The coating film coated with AD-1 was exposed.
Thereafter, the entire substrate was baked in an oven at 200 ° C. for 30 minutes to obtain an optical laminate having a patterned optically anisotropic layer (thickness: 4 μm). In the patterned optically anisotropic layer, a region having 90 ° optical rotatory power and a region optically isotropic are connected in stripes with a line width of 3 μm, as shown in FIG. Were arranged.
The Re (550) and Rth (550) in the optically isotropic region were 0 nm. Moreover, the area | region which has 90 degree | times shows the area | region which is 90 degrees shown in FIG.

Comparative Example 1
In the same manner as in Example 1, a coated glass substrate with a film thickness of 0.5 μm was obtained. Next, the wire grid polarizing plate is disposed on the coating film so that the polarization axis is 45 ° with respect to the coating direction, and the wire grid polarizing plate is further placed on the surface opposite to the coating film side. The coating film was placed, and the coating film was irradiated with ultraviolet light at 30 mJ / cm ² using a Canon-PLA-501F exposure machine under air at 25 ° C., to obtain an alignment film. .
Next, composition LC-5 for optically anisotropic layers was apply | coated on the obtained alignment film. Next, the obtained coating film is aged by heating at a film surface temperature of 80 ° C. for 60 seconds to orient the liquid crystal compound, and immediately thereafter, using an air-cooled metal halide lamp under air at a film surface temperature of 70 ° C. The coating film was irradiated with ultraviolet light at 500 mJ / cm ² to obtain an optical laminate having a patterned optically anisotropic layer. In the patterned optically anisotropic layer, a region having 90 ° optical rotation and a region optically isotropic are arranged in a stripe with a line width of 50 μm.

<Evaluation (Part 1)>
Pure water is applied on a CL liquid crystal layer that selectively reflects light of 530 nm prepared by the procedure described later, and the patterned optical anisotropic layer adheres closely to the CL liquid crystal layer in the optical laminate obtained in Example 1 It bonded together like that, and produced the measurement sample. The measurement sample thus obtained is irradiated with white light from the direction normal to the surface of the patterned optically anisotropic layer with an automatic variable photometer GP-200 (manufactured by Murakami Color Research Laboratory), and the light receiving angle is The green reflected light due to the twist phase difference was evaluated while changing it, and the reflected light wavelength at a light receiving angle of 60 ° at an angle of 60 ° to the normal direction was maintained at 530 nm.
On the other hand, when the patterned optically anisotropic layer obtained in Comparative Example 1 was laminated on the CL liquid crystal layer in the same procedure and the same evaluation was performed, the reflected light wavelength at a light receiving angle of 60 ° was 450 nm. There was a short wavelength shift characteristic of the twist phase difference.

(Preparation method of CL liquid crystal layer which selectively reflects light of 530 nm)
The composition A for alignment film was uniformly coated on a glass substrate using a slit coater, and then dried for 2 minutes in an oven at 100 ° C. to obtain a glass substrate with a film thickness of 0.5 μm. The coating was rubbed in a direction parallel to the coating direction to obtain an alignment film.
Next, the composition LC-3 for optically anisotropic layer was applied onto the rubbing-treated surface of the alignment film. Next, the obtained coating film is aged by heating at a film surface temperature of 80 ° C. for 60 seconds to orient the liquid crystal compound, and immediately thereafter, an air-cooled metal halide lamp (eye graphic with a film surface temperature of 70 ° C.) The coating film was irradiated with ultraviolet light at 500 mJ / cm ² using a Co., Ltd. product to manufacture a CL liquid crystal layer that selectively reflects light of 530 nm.

According to the same procedure as in Example 1 except that the type of mask is changed, a region having a 90 ° optical rotatory power with a diameter D of 3 μm and the other optically isotropic as shown in FIG. A patterned optically anisotropic layer was obtained in which a certain region and the region were present in the same plane. The area ratio of the region having 90 ° optical rotation to the other optically isotropic region was 1: 1. When the above <Evaluation (Part 1)> was performed using the obtained patterned optically anisotropic layer, although the effect was slightly inferior to Example 1, the effect was superior to Comparative Example 1.
Further, according to the same procedure as in Example 1 except that the type of the mask is changed, a region having a 30 μm square 90 ° optical rotatory power and the other optically isotropic regions as shown in FIG. A patterned optically anisotropic layer was obtained in the same plane. The area ratio of the region having 90 ° optical rotation to the other optically isotropic region was 1: 1. When the above <Evaluation (Part 1)> was performed using the obtained patterned optically anisotropic layer, although the effect was slightly inferior to Example 1, the effect was superior to Comparative Example 1.

  In addition, when the above <Evaluation (Part 1)> was performed using the patterned optically anisotropic layer obtained in Examples 2 to 8 described later, although the effect was slightly inferior to Example 1, the Comparative Example The effect was better than 1.

Example 2
Composition A for alignment film was uniformly coated on a glass substrate using a slit coater. Thereafter, the glass substrate coated with the composition for alignment film A was dried in an oven at 100 ° C. for 2 minutes to obtain a glass substrate with a film thickness of 0.5 μm. The coating was rubbed in a direction parallel to the coating direction to obtain an alignment film.
Next, composition LC-1 for optically anisotropic layers was apply | coated on the rubbing process surface of alignment film. Next, the obtained coating film is aged by heating at a film surface temperature of 80 ° C. for 60 seconds to orient the liquid crystal compound, and immediately thereafter, an air-cooled metal halide lamp (eye graphic with a film surface temperature of 70 ° C.) The coating film was irradiated with ultraviolet light at 500 mJ / cm ² using Co., Ltd.) to promote cationic polymerization.
The protective layer composition AD-1 was applied onto the resulting coated film, and dried at 80 ° C. for 60 seconds. Thereafter, under a condition of 25 ° C., under the condition of air, using a Canon-PLA-501F exposure device (super high pressure mercury lamp), a protective layer composition through a predetermined mask at an exposure amount of 50 mJ / cm ² The coating film on which the product AD-1 was applied was exposed.
Thereafter, the entire substrate was baked in an oven at 200 ° C. for 30 minutes to obtain an optical laminate having a patterned optically anisotropic layer (thickness: 3.2 μm). In the patterned optically anisotropic layer, a region having a retardation of 140 nm and a region optically isotropic are formed in stripes with a line width of 3 μm as shown in FIG. It was arranged in a row.

Example 3
A composition B for alignment film is uniformly coated on a glass substrate using a slit coater instead of the composition A for alignment film used in Example 2, and then a wire is made so that the polarization axis is parallel to the application direction. A grid polarizing plate (product code # 46-636 manufactured by Edmond) is disposed on the coating film, and the coating film is irradiated with ultraviolet light at 30 mJ / cm ² using a PLA-501F exposure machine manufactured by Canon Inc. I got a membrane.
The composition LC-1 for optically anisotropic layer is applied on the obtained alignment film, and the procedure thereafter is the same as that of Example 2 to obtain an optical laminate having a patterned optically anisotropic layer I got In the patterned optically anisotropic layer, as shown in FIG. 9, a region having a phase difference of 140 nm and a region optically isotropic continue in stripes with a line width of 3 μm. It was arranged.

Example 4
According to the same procedure as in Example 3, the protective layer composition AD-1 was applied onto the coating and dried at 80 ° C. for 60 seconds. Thereafter, under a condition of 25 ° C., under a condition of air at 25 ° C., using a Canon-PLA-501F exposure device (super high pressure mercury lamp), a protective layer composition through a predetermined mask at an exposure amount of 40 mJ / cm ² The coating film coated with AD-1 was exposed.
Thereafter, the entire substrate was baked in an oven at 200 ° C. for 30 minutes to obtain an optical laminate having a patterned optically anisotropic layer. In the patterned optically anisotropic layer, as shown in FIG. 7, the region having a phase difference of 140 nm and having a diameter D of 3 μm is the same as the other optically isotropic region. It was located inside. The area ratio of the region having retardation to the other optically isotropic region was 1: 1.

Example 5
After the composition B for alignment film is uniformly coated on a glass substrate using a slit coater, a wire grid polarizer (product code # 46-636) so that the polarization axis is inclined at 22.5 ° with respect to the coating direction. points arranged Edmond Ltd.), and, except for changing the amount of exposure of 50 mJ / cm ² when the applied radiation after the protective layer composition AD-1 to the exposure amount of 70 mJ / cm ^2, the embodiment An optical laminate was obtained according to the same procedure as 3.
The patterned optically anisotropic layer in the obtained optical laminate is optically isotropic with a region having a retardation of 250 nm in which the slow axis direction is inclined by 22.5 ° with respect to the coating direction. As shown in FIG. 9, the regions were arranged in a stripe shape with a line width of 3 μm.
The obtained patterned optically anisotropic layer and the patterned optically anisotropic layer obtained in Example 3 are superimposed so that the patterning directions are orthogonal to each other, and the phase difference and the delay are formed like a checkered 3 μm square. An optical laminate with a changed phase axis was obtained.

Example 6
The point which used composition LC-2 for optical anisotropic layers instead of composition LC-1 for optical anisotropic layers, and 40 mJ / in the case of irradiation after applying protective layer composition AD-1 except for changing the amount of exposure cm ² exposure amount of 35 mJ / cm ^2, according to the procedure as in example 4 to obtain an optical laminate.
In the patterned optically anisotropic layer in the obtained optical laminate, as shown in FIG. 7, a region having a twist retardation of 3 μm in diameter D and selectively reflecting light of 850 nm, and others And the optically isotropic area of the are disposed in the same plane. In addition, the area ratio of the region having retardation to the other optically isotropic region was 1: 1.

Example 7
A coated film was formed according to the same procedure as Example 3, except that the composition LC-3 for optically anisotropic layer was used instead of the composition LC-1 for optically anisotropic layer, and the obtained coating was obtained. On the film, the protective layer composition AD-1 was applied and dried at 80 ° C. for 60 seconds.
After that, under a condition of 25 ° C. under a condition of air, using a Canon-PLA-501F exposure machine (super high pressure mercury lamp), a protective layer composition through a predetermined mask at an exposure dose of 70 mJ / cm ² The coating film coated with AD-1 was exposed.
Thereafter, the entire substrate was baked in an oven at 200 ° C. for 30 minutes to obtain an optical laminate having a patterned optically anisotropic layer. In the patterned optically anisotropic layer, as shown in FIG. 8, a region having a twist retardation which selectively reflects light of 530 nm in a size of 30 μm and a region which is optically isotropic other than that And were arranged in the same plane.

Example 8
An optical laminate was obtained according to the same procedure as Example 7, except that the composition LC-4 for optically anisotropic layer was used instead of the composition LC-3 for optically anisotropic layer.
In addition, in the patterned optically anisotropic layer in the obtained optical laminate, as shown in FIG. 8, a 30 μm square region having a twist retardation which selectively reflects 450 nm light, and the other optical regions. The regions that are truly isotropic were arranged in the same plane.

Comparative Example 2
An optical laminate was obtained according to the same procedure as Comparative Example 1, except that the composition L-1 for optically anisotropic layer was used instead of the composition L-5 for optically anisotropic layer.
In the patterned optically anisotropic layer in the obtained optical laminate, the region having a retardation of 140 nm and the region optically isotropic have line widths as shown in FIG. At 50 μm, they were arranged in a stripe.

Comparative Example 3
According to the same procedure as in Example 7 except that exposure was performed at an exposure dose of 70 mJ / cm ² without using a mask, an optical anisotropy in which a region having a torsional retardation which selectively reflects light of 530 nm is present over the entire surface An optical laminate having a property layer is obtained.

Comparative Example 4
According to the same procedure as in Example 8 except that exposure was performed at an exposure dose of 70 mJ / cm ² without using a mask, an optical anisotropy in which a region having a torsional retardation which selectively reflects light of 450 nm is present over the entire surface An optical laminate having a property layer is obtained.

<Evaluation (Part 2)>
(Evaluation; boundary discrimination)
The obtained patterned optically anisotropic layer is observed with a cross nicol optical microscope (ECLIPSE LV100N POL; manufactured by Nikon Corporation) containing a λ / 4 plate for detection, and a retardation region and an isotropic region ( The sharpness (boundary discrimination) of the boundary portion of the optically isotropic region was evaluated.
The patterned optically anisotropic layer obtained in Examples 2 and 3 has excellent boundary discrimination with a thin line of 3 μm as shown in FIG. 10, and the boundary area is less than 1 μm (below the detection limit). there were. On the other hand, in the patterned optically anisotropic layer obtained in Comparative Example 2, as shown in FIG. 11, the boundary is vague, and the boundary discrimination is inferior.
The optically isotropic regions in the patterned optically anisotropic layer obtained in Examples 2 to 8 show an ideal luminance profile, and the retardations (Re (550) and Rth (550)) are approximately equal. It turned out that it is 0 nm.
In addition, the patterned optically anisotropic layer obtained in Example 6 is observed with an optical microscope using a reflective light source that extracts only infrared light with a visible light cut filter, and isotropic with the twist retardation region. When the boundary discrimination of the area was evaluated, it had excellent boundary discrimination as in Examples 2 to 5, and the boundary area was less than 1 μm (below the detection limit).

<Evaluation (3)>
After the PlayStation VR manufactured by Sony Interactive Entertainment Inc. was disassembled and the sheet (microlens array) bonded to the display unit was removed, the optical laminate obtained in Example 2 was bonded to the display unit. At that time, an adhesive is disposed on the surface of the patterned optically anisotropic layer in the optical laminate obtained in Example 2, and the display unit and the optical laminate are bonded via the adhesive. did. Next, an image was displayed again on the obtained device, and the image was observed through the lens, and the following three items were evaluated.
On the other hand, when the optical laminate of Comparative Example 2 was similarly bonded and evaluated, all were D evaluation.

[Pixel grid visibility]
The image displayed on the image display unit was a solid white image, the pixel grid was visually observed, and scoring was performed in the following four steps. Preferably no pixel grid is visible.
A: grid not visible B: grid visible but light C: grid visible but within tolerance D: grid visible

[Image sharpness]
A white line (pixel 1 line) was displayed on a black background on the image display unit, and the degree of blurring of the white line was visually observed, and scoring was performed in the following four stages.
A: White line blur not visible B: White line blur visible but light C: White line blur visible but within tolerance D: White line blur noticeable

[Giratsuki]
The image displayed on the image display unit was a white solid image, and glare was observed visually, and scoring was performed in the following four steps.
A: no glaring confirmed B: glaring confirmed but slight C: glaring confirmed but within tolerance D: glaring noticeable

(Evaluation; Evaluation 1 of optical laminate)
The optical laminate obtained in Example 5 is bonded to an adhesive (SK dyne; manufactured by Soken Chemical Co., Ltd.) on the front of a liquid crystal monitor (LL-W221-W; manufactured by Sharp Corporation), and a polarizing plate is manufactured. As a result of visual observation, it was found that in the pasted area of the optical laminate obtained in Example 5, the polarized light emitted from the monitor was eliminated, and no rough spots, color unevenness and bright spots were generated. The
On the other hand, when the same evaluation was performed in the optical laminate of Comparative Example 2, although polarization was eliminated as in Example 5, a lot of roughness, color unevenness, and bright spots were generated.

<Evaluation (Part 4)>
The optical laminate obtained in Example 5 and a wire grid polarizing plate filter (product code # 33-082, manufactured by Edmond Co., Ltd.) are bonded in this order with an adhesive to produce a polarization detection filter, and USB (Universal) The polarization detection filter was attached to the light receiving surface of a Serial Bus) camera (UI-1490LE-M, manufactured by Prolinks Co., Ltd.) with an adhesive to produce a polarization imaging sensor. At this time, the wire grid polarizing plate filter side was made to be adjacent to the light receiving element. When an injection molded plastic (made of polycarbonate) was photographed with such a polarization detection camera, polarization information corresponding to the internal stress was obtained without detection error.
On the other hand, when the same evaluation was performed on the optical laminate obtained in Comparative Example 2, detection errors frequently occurred, and correct polarization information could not be obtained.

<Evaluation (Part 5)>
The patterned optically anisotropic layer in the optical laminate obtained in Example 6 is irradiated with light collected by IR (Infrared) laser light through a lens, and the IR image projected on the wall 1 m away is RADIATION Photographed with SCOPE KEC-811 (manufactured by Quantum Electronics Co., Ltd.), IR light is shielded to become a dark portion in a portion where a region having a twist phase difference is disposed, and IR light is transmitted and bright in an isotropic region. As a result, discrimination between dark and light areas was clear.

<Evaluation (Part 6)>
The optical laminate obtained in Example 7 is mounted between a light emitting pixel and a circularly polarizing plate so that a region having a twist retardation overlaps with a green pixel of a commercially available OLED (Organic Light Emitting Diode) panel, and at the time of green light emission The luminance and the reflectance at the time of extinction were evaluated by a spectroradiometer SR-3 (manufactured by TOPCON CORPORATION). As a result, the luminance was improved by 10% with respect to the luminance when there was no optical laminate. The reflectance decreased by 0.8%.
On the other hand, when the optical laminate obtained in Comparative Example 3 was similarly evaluated, the luminance was improved by 10% similarly to the optical laminate obtained in Example 7, but the reflectance was degraded by 5% or more. .

<Evaluation (7)>
The optical laminate obtained in Example 8 is mounted between a light emitting pixel and a circularly polarizing plate so that a region having a twist phase difference overlaps the blue pixel of a commercially available OLED panel, and the luminance at the time of blue light emission and extinction When the reflectance was evaluated by a spectroradiometer SR-3 (manufactured by Topcon Corporation), the luminance was improved by 14% with respect to the luminance when the optical laminate obtained in Example 7 was not present. The reflectance decreased by 0.7%.
On the other hand, when the optical laminate obtained in Comparative Example 4 was similarly evaluated, the luminance was improved by 14% similarly to the optical laminate obtained in Example 8, but the reflectance was deteriorated by 6% or more. .

REFERENCE SIGNS LIST 10 optical laminate 12 support 14 alignment film 16 a, 16 b, 16 c, 16 d patterned optically anisotropic layer 18 a, 18 b, 18 c, 18 d first region 20 a, 20 b, 20 c, 20 d second region 22 coating film 24 boundary region

Claims (6)

A patterned optically anisotropic layer formed using a composition containing a liquid crystalline compound,
The patterned optically anisotropic layer has a first region on which the aligned liquid crystal compound is immobilized, and a second region which is optically isotropic,
A patterned optically anisotropic layer, wherein the width of at least one of the first region and the second region is less than 50 μm.   The patterned optically anisotropic layer according to claim 1, wherein a width of at least one of the first region and the second region is 30 μm or less.   The patterned optically anisotropic layer according to claim 1, wherein the first region and the second region are alternately arranged in a stripe shape.   The patterned optically anisotropic layer according to claim 1, wherein one of the first region and the second region is dot-shaped.   The patterned optical anisotropy according to any one of claims 1 to 4, wherein the first region is a region formed by fixing a liquid crystal compound twisted and oriented along a helical axis extending along the thickness direction. Sex layer. A support,
An alignment film disposed on the support;
An optical laminate comprising: the patterned optically anisotropic layer according to any one of claims 1 to 5 disposed on the alignment film.