JP7404029B2 - optical laminate - Google Patents

Description

The present invention relates to a polarizer composite and an optical laminate.

Polarizers are widely used as polarized light supply elements and polarized light detection elements in display devices such as liquid crystal display devices and organic electroluminescent (EL) display devices. Display devices equipped with polarizers are also being used in mobile devices such as notebook personal computers and mobile phones, and due to demands for diversification of display purposes, clarification of display categories, decoration, etc. Polarizers with different regions are required. Particularly in small and medium-sized mobile terminals such as smartphones and tablet terminals, a polarizer is sometimes pasted over the entire display surface in order to create a borderless design over the entire surface from a decorative point of view. In this case, the polarizer may overlap the camera lens area and the icon or logo printing area at the bottom of the screen, resulting in problems such as poor camera sensitivity and poor design.

For example, in Patent Document 1, a polarizer included in a polarizing plate is partially provided with a dichroic substance low concentration area where the dichroic substance content is relatively low, and the dichroic substance low concentration area is corresponded to the dichroic substance low concentration area. It is stated that by arranging the camera in such a way that the camera performance is not adversely affected.

Japanese Patent Application Publication No. 2015-215609

In Patent Document 1, a resin film containing a dichroic substance is subjected to a chemical treatment of contacting with a basic solution to partially decolorize the resin film to form a dichroic substance low concentration area. The basic solution used for decolorization requires time and cost to dispose of as waste liquid. Further, Patent Document 1 describes that when iodine is used as a dichroic substance, by contacting it with a basic solution, the iodine content can be reduced and a dichroic substance low concentration area can be formed. ing. However, there is no disclosure regarding a specific method for forming a dichroic substance low concentration area when a dichroic substance other than iodine is used.

An object of the present invention is to provide a polarizer composite and an optical laminate including a novel polarizer that can replace a polarizer in which a region with a low dichroic substance content is formed through chemical treatment such as decolorization.

The present invention provides the following polarizer composite and optical laminate.
[1] Polarized light comprising a polarizer, a retardation layer and a first reinforcing material provided on one surface of the polarizer, and a second reinforcing material provided on the other surface of the polarizer. a child complex,
The polarizer has a polarizing region having a thickness of 15 μm or less, and a non-polarizing region surrounded by the polarizing region in plan view,
The retardation layer has a retardation region that has a retardation property and exists in a region corresponding to the polarization region, and a non-retardation region that does not have a retardation property and exists in a region corresponding to the non-polarization region. having a region,
The first reinforcing material is
a plurality of first cells each having an open end surface, each of which is arranged such that each open end surface faces the surface of the polarizer;
A cell region where the first cell exists and which exists in a region corresponding to the polarizing region, and a non-cell region which exists in a region where the first cell does not exist and corresponds to the non-polarizing region. ,
The second reinforcing material is
a plurality of second cells each having an open end surface, each of which is arranged such that each open end surface faces the surface of the polarizer;
the second cell is present in an area corresponding to at least the non-polarizing area,
The non-polarizing region, the non-retardation region, and the non-cell region include a cured product of an active energy ray-curable resin,
The cured material included in the non-polarizing region is provided in a through hole surrounded by the polarizing region in a plan view,
A polarizer composite, wherein the cured material included in the non-retardation region is provided in a through hole surrounded by the retardation region in plan view.
[2] The polarizer composite according to [1], wherein the retardation layer and the first reinforcing material are provided in this order from the polarizer side.
[3] The polarizer composite according to [1], wherein the first reinforcing material and the retardation layer are provided in this order from the polarizer side.
[4] Any one of [1] to [3], wherein the thickness of the cured product is the same as the thickness of the layered structure portion including the polarizing region, the retardation region, and the cell region in the polarizer composite. A polarizer complex described in Crab.
[5] Any one of [1] to [3], wherein the thickness of the cured product is smaller than the thickness of a layered structure portion including the polarizing region, the retardation region, and the cell region in the polarizer composite. Polarizer composite described in.
[6] Any one of [1] to [3], wherein the thickness of the cured product is greater than the thickness of a laminated structure portion including the polarizing region, the retardation region, and the cell region in the polarizer composite. Polarizer composite described in.
[7] The polarizer composite according to any one of [1] to [6], wherein the retardation region is a polymerized and cured layer of a polymerizable liquid crystal compound.
[8] The polarizer composite according to any one of [1] to [7], wherein the non-polarizing region has light-transmitting properties.
[9] The polarizer composite according to any one of [1] to [8], wherein the non-polarizing region has a diameter in a plan view of 0.5 mm or more and 20 mm or less.
[10] The polarizer composite according to any one of [1] to [9], wherein the active energy ray-curable resin contains an epoxy compound.
[11] The polarizer composite according to [10], wherein the epoxy compound includes an alicyclic epoxy compound.
[12] The polarized light according to any one of [1] to [11], wherein the apertures of the first cell and the second cell each independently have a polygonal shape, a circular shape, or an elliptical shape. Child complex.
[13] The polarizer composite according to any one of [1] to [12], further comprising a light-transmitting filler provided in the inner space of the first cell.
[14] The polarizer composite according to any one of [1] to [13], further comprising a light-transmitting filler provided in the inner space of the second cell.
[15] An optical laminate comprising a protective layer on one side or both sides of the polarizer composite according to any one of [1] to [14].

According to the present invention, a polarizer composite and an optical laminate including a novel polarizer can be provided.

(a) is a schematic cross-sectional view schematically showing an example of the polarizer composite of the present invention, and (b) is a schematic plan view of the polarizer composite shown in (a) on the first reinforcing material side. (c) is a schematic plan view of the polarizer composite shown in (a) on the second reinforcing material side. (a) and (b) are schematic cross-sectional views schematically showing other examples of the polarizer composite of the present invention. (a) and (b) are diagrams schematically showing an example of a cross section around a non-polarizing region, a non-retardation region, and a non-cell region of a polarizer composite, in which the non-polarizing region, the non-retardation region , and an explanatory diagram for explaining a method of determining the thickness of a cured material provided in a non-cell region. FIG. 3 is a schematic cross-sectional view schematically showing another example of the polarizer composite of the present invention. (a) to (d) are schematic cross-sectional views schematically showing an example of a method for manufacturing a polarizer composite of the present invention. (a) to (c) are schematic cross-sectional views schematically showing a continuation of the method for manufacturing the polarizer composite shown in FIG. 5. (a) to (c) are schematic cross-sectional views schematically showing a continuation of the method for manufacturing the polarizer composite shown in FIG. 6. (a) to (e) are schematic cross-sectional views schematically showing another example of the method for producing a polarizer composite of the present invention. (a) to (d) are schematic cross-sectional views schematically showing a continuation of the method for manufacturing the polarizer composite shown in FIG. 8. 1 is a schematic cross-sectional view schematically showing an example of an optical laminate of the present invention. It is a schematic sectional view showing typically another example of an optical layered product of the present invention.

Hereinafter, preferred embodiments of the polarizer composite and optical laminate of the present invention will be described with reference to the drawings. In all the drawings below, each component is shown adjusted to an appropriate scale to make it easier to understand, and the scale of each component shown in the drawings does not necessarily match the actual scale of the component.

<Polarizer composite>
(Polarizer composite (1))
FIG. 1(a) is a schematic cross-sectional view schematically showing an example of the polarizer composite of this embodiment, and FIG. 1(b) is a first reinforcing material side of the polarizer composite shown in (a). FIG. 1(c) is a schematic plan view of the polarizer composite shown in FIG. 1(a) on the second reinforcing material side. FIGS. 2A and 2B are schematic cross-sectional views schematically showing another example of the polarizer composite of this embodiment. The polarizer composite 40 shown in FIGS. 1 and 2 includes a polarizer 10, a retardation layer 71, a first reinforcing material 50, and a second reinforcing material 60. The polarizer composite 40 has a retardation layer 71 and a first reinforcing material 50 in this order on one surface of the polarizer 10, and a second reinforcing material 60 on the other surface of the polarizer 10.

The polarizer 10 included in the polarizer composite 40 has a polarizing region 11 and a non-polarizing region 12, as shown in FIG. 1(a). The thickness of the polarizing region 11 is 15 μm or less. The non-polarizing region 12 is a region surrounded by the polarizing region 11 when the polarizer 10 is viewed in plan.

The arrangement of the polarizing region 11 and the non-polarizing region 12 in the polarizer 10 is not particularly limited as long as the polarizing region 11 is provided so as to surround the non-polarizing region 12. In a plan view of the polarizer 10, the total area occupied by the polarizing regions 11 is preferably larger than the total area occupied by the non-polarizing regions 12. The polarizer 10 only needs to have one non-polarizing region 12, and may have two or more non-polarizing regions 12. When having two or more non-polarizing regions 12, the shapes of the respective non-polarizing regions 12 may be the same or different from each other.

The retardation layer 71 can be provided on one side of the polarizer 10 via a bonding layer (not shown). Examples of the bonding layer include a pressure-sensitive adhesive layer or an adhesive layer. Examples of the adhesive for forming the adhesive layer and the adhesive for forming the adhesive layer include the adhesive and the adhesive used for forming the filler described below. As shown in FIG. 1A, the retardation layer 71 includes a retardation region 75 having retardation characteristics and a non-retardation region 76 not having retardation characteristics. The retardation region 75 refers to a region in which at least one of the in-plane retardation value (R0) and the thickness direction retardation value (Rth) exceeds 40 nm at a wavelength of 590 nm. The non-retardation region 76 refers to a region in which the in-plane retardation value (R0) and the thickness direction retardation value (Rth) are each 40 nm or less at a wavelength of 590 nm.

The in-plane retardation value (R0) is a retardation value in a direction (in-plane direction) perpendicular to the thickness direction of the retardation layer 70, and can be determined by the following formula (I). The thickness direction retardation value (Rth) is the retardation value of the retardation layer 70 in the thickness direction, and can be determined by the following formula (II). The in-plane retardation value (R0) and the thickness direction retardation value (Rth) are both measured with light having a wavelength of 590 nm at a temperature of 23°C.
R0=(Nx-Ny)×d(I)
Rth=[{(Nx+Ny)/2}-Nz]×d (II)
[In formula (I) and formula (II),
Nx is the refractive index in the direction in which the in-plane refractive index is maximum (that is, the slow axis direction),
Ny is the refractive index in the direction perpendicular to the slow axis in the plane (that is, the fast axis direction),
Nz is the refractive index in the thickness direction,
d is the thickness [nm] of the retardation layer. ]
The in-plane retardation value (R0) and the thickness direction retardation value (Rth) can be measured, for example, with a birefringence measuring device (trade name: KOBRA-WPR) manufactured by Oji Scientific Instruments.

In the retardation layer 71 included in the polarizer composite 40, the retardation region 75 exists in a region corresponding to the polarization region 11 of the polarizer 10, and the non-retardation region 76 corresponds to the non-polarization region 12 of the polarizer 10. Exist in the area where Here, the retardation region 75 existing in the region corresponding to the polarization region 11 means that the retardation region 75 and the polarization region 11 have substantially the same shape and size as each other in the planar view direction, and similarly, When the non-retardation region 76 is located in a region corresponding to the non-polarization region 12, it means that the non-retardation region 76 and the non-polarization region 12 are located at approximately the same position, have approximately the same shape, and approximately the same size (diameter) in the plane view direction. ). In other words, when the non-retardation area 76 is projected onto the polarizer 10 in the plan view direction, the projected area of the non-retardation area 76 and the non-polarization area 12 on the polarizer 10 are approximately the same. Say something. According to the means for manufacturing a polarizer composite described below, a polarizer composite in which the retardation region 75 is present in the region corresponding to the polarizing region 11 can be efficiently manufactured. When the polarizer 10 included in the polarizer composite 40 has two or more non-polarizing regions 12, if the non-retardation region 76 exists in the region corresponding to at least one non-polarizing region 12, other A retardation region 75 may be present in the region corresponding to the non-polarizing region 12.

The polarizer composite 40 may have one layer of retardation layer 71 on one side of the polarizer 10, or may have two or more retardation layers 71. When having two or more retardation layers, the retardation layers may be laminated with each other via a bonding layer, and a retardation layer may be further provided on the side of the first reinforcing material 50 opposite to the polarizer 10 side. Good too. The retardation characteristics of two or more retardation layers may be the same or different. In the case where the polarizer composite 40 further includes a retardation layer on the side opposite to the polarizer 10 side of the first reinforcing material 50, this retardation layer may be the retardation layer 71, and the entire retardation layer It may be a retardation layer (a retardation layer without a non-retardation layer) consisting of a region.

As shown in FIG. 1B, the first reinforcing material 50 of the polarizer composite 40 has a plurality of first cells 51 each having an open end surface, and each open end surface faces the surface of the polarizer 10. It is arranged as follows. The first reinforcing material 50 has a cell region 55 where the first cells 51 are present and a non-cell region 56 where the first cells 51 are not present. The first cell 51 has a hollow columnar (cylindrical) structure surrounded by cell partition walls 53 that partition the first cell 51, and both axial ends of the columnar structure are open end faces. be. The non-cell region 56 in which the first cell 51 does not exist is a region in which the cell partition wall 53 constituting the first cell 51 and the hollow columnar (cylindrical) space surrounded by the cell partition wall 53 do not exist.

In the first reinforcing material 50, the cell region 55 is present in a region corresponding to the polarizing region 11 present in the polarizer 10, and the non-cell region 56 is present in a region corresponding to the non-polarizing region 12 of the polarizer 10. . Here, the expression that the cell region 55 exists in a region corresponding to the polarizing region 11 means that the cell region 55 and the polarizing region 11 have approximately the same shape and approximately the same size as each other in the planar view direction; The cell region 56 being in the region corresponding to the non-polarizing region 12 means that the non-cell region 56 and the non-polarizing region 12 are in substantially the same position, have substantially the same shape, and substantially the same size (diameter) in the planar view direction. means. In other words, when the non-cell area 56 is projected onto the polarizer 10 in a plan view direction, the projected area of the non-cell area 56 and the non-polarizing area 12 on the polarizer 10 are approximately the same. say. According to the means for manufacturing a polarizer composite described below, a polarizer composite in which the cell region 55 is present in the region corresponding to the polarizing region 11 can be efficiently manufactured. When the polarizer 10 included in the polarizer composite 40 has two or more non-polarizing regions 12, if a non-cell region 56 exists in the region corresponding to at least one non-polarizing region 12, other non-polarizing regions 12 are present. A cell region 55 may exist in a region corresponding to (projecting) the polarization region 12 . At least one non-cell region 56 is preferably provided in a region corresponding to the non-polarizing region 12 and corresponding to the non-retardation region 76.

As shown in FIG. 1(c), the second reinforcing material 60 of the polarizer composite 40 has a plurality of second cells 61 each having an open end surface, and each open end surface faces the surface of the polarizer 10. It is arranged as follows. Like the first cell 51, the second cell 61 has a hollow columnar (cylindrical) structure surrounded by cell partition walls 63 that partition the second cell 61, and both ends of the columnar structure in the axial direction are open. It has an open end surface. In the second reinforcing material 60, unlike the first reinforcing material 50, second cells 61 are also present in the region corresponding to the non-polarizing region 12 (the part indicated by the dotted line in FIG. 1(c)). In the second reinforcing material 60, it is preferable that the second cells 61 exist in both the polarizing region 11 and the non-polarizing region 12, and it is more preferable that the second cells 61 exist on the entire surface of the polarizer 10.

The non-polarizing region 12 of the polarizer 10, the non-retardation region 76 of the retardation layer 71, and the non-cell region 56 of the first reinforcing material 50 are made of active energy ray curable resin (hereinafter referred to as "curable resin (X)"). Contains the cured product of ). The non-polarizing region 12 is a region in which a cured product of curable resin (X) is provided in a through hole 22 surrounded by the polarizing region 11 in plan view. The non-retardation region 76 is surrounded by the retardation region 75 in a plan view, and a cured product of the curable resin (X) is provided in a through hole 72 provided in a region corresponding to the above-described through hole 22. It is an area. The non-cell region 56 is provided by cutting out all or part of the plurality of first cells 51, and is filled with curable resin (X) in the through hole 52 provided in the region corresponding to the above-described through hole 22. This is the area where the cured product is provided.

The through holes 22 of the polarizer 10, the through holes 72 of the retardation layer 71, and the through holes 52 of the first reinforcing material 50 can have the same shape in plan view. The through holes 22, 72, 52 may be communicated in the thickness direction of the polarizing region 11, and a cured product of the curable resin (X) may be provided across the communicating through holes 22, 72, 52. Can be done.

The polarizer 10 included in the polarizer composite 40 has a non-polarizing region 12, as shown in FIG. 1(a). Therefore, when applying the polarizer composite 40 to a display device such as a liquid crystal display device or an organic EL display device that is used in smartphones, tablet terminals, etc., it is possible to Alternatively, by arranging a printed portion such as a logo, a decrease in camera sensitivity and a decrease in design can be suppressed. In particular, in the polarizer composite 40, the retardation layer 71 has a non-retardation region 76. Therefore, by arranging a printed part such as a camera lens, an icon, or a logo in correspondence with the non-polarizing area 12 and the non-retardation area 76, it is possible to further suppress a decrease in camera sensitivity and design. can.

Since the polarizer 10 has a non-polarizing region 12, cracks are likely to occur around the non-polarizing region 12 due to shrinkage of the polarizer 10 due to temperature changes when applied to a display device or the like. Furthermore, since the polarizing region 11 of the polarizer 10 is as thin as 15 μm or less, it is considered that cracks are likely to occur when subjected to impact. In the polarizer composite 40, since the polarizer 10 is provided between the first reinforcing material 50 and the second reinforcing material 60 as described above, cracks may occur when subjected to temperature change or impact. It is thought that progress of fine cracks into large cracks can be suppressed.

In the polarizer composite 40, the non-polarizing region 12, the non-retardation region 76, and the non-cell region 56 contain the cured product of the curable resin (X), so that the through holes 22 of the polarizer 10 and the retardation layer 71 The through hole 72 of the first reinforcing member 50 and the through hole 52 of the first reinforcing member 50 can be made solid. Since the thickness of the polarizer 10 included in the polarizer composite 40 is as thin as 15 μm or less, the cured product of the curable resin (X) is not provided in the non-polarizing region 12 and the through hole 22 is in a hollow state. When the polarizer is applied to a display device, shrinkage of the polarizer due to temperature changes may cause problems such as cracks occurring around the through hole 22. On the other hand, like the polarizer 10 included in the polarizer composite 40, by providing the cured product of the curable resin (X) in the through holes 22, 72, 52, the non-polarizing region 12, the non-retardation region 75 , and the non-cell region 56 can be made solid, so the occurrence of the above-mentioned problems can be suppressed.

The thickness of the cured product of the curable resin (X) provided in the polarizer composite 40 is the same as the thickness of the layered structure portion including the polarizing region 11, the retardation region 75, and the cell region 55 in the polarizer composite 40. (FIG. 1(a)), may be smaller than the thickness of the layered structure portion (FIG. 2(a)), or may be larger than the thickness of the layered structure portion (FIG. 2(b)). ). The thickness of the laminated structure portion may be the total thickness of the polarization region 11, the retardation region 75, and the cell region 55, and this total thickness includes the polarization region 11, the retardation region 75, and the cell region 55. The thickness of the layer interposed between the cell region 55 and the cell region 55 may be included. For example, when the polarizer composite 40 has a bonding layer between the polarizer 10 and the retardation layer 71, the thickness of the laminated structure portion is equal to the thickness of the polarizing region 11 and the thickness of the retardation region 75. The thickness of the laminating layer is also taken into account in addition to the total thickness of . The cured product of the curable resin (X) provided in the polarizer composite 40 covers at least a portion of the through hole 22 of the polarizer 10, at least a portion of the through hole 72 of the retardation layer 71, and the first reinforcing material. It is sufficient that the through hole 50 is provided so as to fill at least a portion of the through hole 52. When the polarizer composite 40 has a bonding layer between the polarizer 10 and the retardation layer 71, the curable resin (X) is applied so as to fill at least a portion of the through holes provided in the bonding layer. It is sufficient if a cured product is provided. The cured product of the curable resin (X) is preferably provided so as to fill the entire through hole 22 of the polarizer 10, and fills the entire through hole 22 of the polarizer 10, the entire through hole 72 of the retardation layer 71, and the first through hole 22 of the polarizer 10. More preferably, it is provided so as to fill the entire through hole 52 of the reinforcing material 50 and the entire through hole of the bonding layer.

The thickness of the laminated structure portion including the polarizing region 11, the retardation layer region 75, and the cell region 55 in the polarizer composite 40 is preferably 30 μm or less, more preferably 25 μm or less, and 20 μm or less. It is more preferable that the thickness be 18 μm or less, 16 μm or less, and usually 2 μm or more. If the thickness of the laminated structure portion exceeds the above range, the workability for providing a cured product of the curable resin (X) in the non-polarizing region 12, the non-retardation region 76, and the non-cell region 56 will be reduced, as will be described later. tends to decline. The thickness can be measured using, for example, a contact type film thickness measuring device (MS-5C, manufactured by Nikon Corporation). Note that the thickness of the cell region corresponds to the height of the first cell 51 (the length in the direction perpendicular to the opening end surface of the first cell 51).

The thickness of the cured material provided in the polarizer composite 40 is determined as follows. First, in the polarizer composite 40, a first plane including the surface of the polarizing region 11 of the polarizer 10 (the surface on the opposite side to the retardation layer 71 side) and an opening end surface of the cell region 55 of the first reinforcing material 50 (the opening end face on the opposite side to the polarizer 10 side). Next, in the non-polarizing region 12, a first position where the shortest distance between the surface of the cured product on the polarizer 10 side and the first plane is maximum, and a first position of the cured product on the first reinforcing material 50 side. A second position where the shortest distance between the surface and the second plane is maximum is determined. Then, the total value (dm+dn+D) of the shortest distance (dm) at the first position, the shortest distance (dn) at the second position, and the distance (D) between the first plane and the second plane is calculated from the polarizer composite. The thickness of the cured product provided at 40.

The thickness of the cured product of the curable resin (X) provided in the non-polarizing area 12, the non-retardation area 76, and the non-cell area 56, and the polarizing area 11, the retardation area 75, and the cell in the polarizer composite 40. A method for determining the thickness when the thickness of the laminated structure portion including the region 55 is different will be specifically explained based on FIG. 3. FIGS. 3(a) and 3(b) are diagrams schematically showing an example of a cross section around a non-polarizing region, a non-retardation region, and a non-cell region of a polarizer composite. FIG. 2 is an explanatory diagram for explaining a method of determining the thickness of a cured material provided in a retardation region and a non-cell region.

As shown in FIG. 3A, when the cured material is provided in the non-polarizing region 12, the non-retardation region 76, and the non-cell region 56, It is assumed that a straight line located in the non-cell region 56 along the front side is the first plane 11m. The length of the straight line (Fig. 3 The position where "dm" in (a) is maximum is defined as the first position. Next, as shown in FIG. 3(a), a straight line shown by a dashed line in the non-polarizing region 12 along the surface side opposite to the retardation layer 71 side of the polarizer 10 is assumed to be the second plane 11n. do. The length of the straight line (Fig. 3 The position where "dn" in (a) is maximum is defined as the second position. Here, as shown in FIG. 3(a), the surfaces of the cured material provided in the non-cell region 56 and the non-polarizing region 12 are the first plane 11m and the second plane in the thickness direction of the polarizer composite 40. If they exist on the inner surface side (on the retardation layer 71 side) of the plane 11n, dm and dn are shown as negative values. Further, the distance between the first plane 11m and the second plane 11n (corresponding to the thickness of the laminated structure portion) is assumed to be D. Then, the thickness of the cured material provided in the non-polarizing area 12, non-retardation area 76, and non-cell area 56 shown in FIG. 3(a) can be determined as D+dm+dn (dm and dn are negative values). Can be done.

Further, as shown in FIG. 3(b), when the cured material is provided in the non-polarizing area 12, the non-retardation area 76, and the non-cell area 56, the same applies to the first plane 11m and the second plane. By assuming the plane 11n, the thickness of the cured material provided in the non-polarizing region 12, the non-retardation region 76, and the non-cell region 56 can be determined. Specifically, first, among the straight lines that connect any point on the first plane 11m and any point on the surface of the cured material provided in the non-cell area 56, the straight line is the shortest distance. The position where the length ("dm" in FIG. 3(b)) is maximum is defined as the first position. Next, the length of the straight line ( The position where "dn" in FIG. 3(b) is maximum is defined as the second position. Here, as shown in FIG. 3(b), the surfaces of the cured material provided in the non-cell region 56 and the non-polarizing region 12 are arranged in the first plane 11m and the second plane in the thickness direction of the polarizer composite 40. If they exist on the outer side of the plane 11n (on the side opposite to the retardation layer 71 side), dm and dn are shown as positive values. Then, the thickness of the cured material provided in the non-polarizing region 12, the non-retardation region 76, and the non-cell region 56 shown in FIG. 3(b) can be determined as D+dm+dn (dm and dn are positive values). Can be done.

The polarizer composite 40 is applied to a display device or the like in a state including the polarizer 10, the retardation layer 71, the first reinforcing material 50, and the second reinforcing material 60. If the internal spaces of the first cells 51 of the first reinforcing material 50 and the second cells 61 of the second reinforcing material 60 are hollow, the difference in refractive index between the cell partition walls 53 and the internal spaces of the first cells 51, There is a possibility that the visibility of the display device may be reduced due to the difference in refractive index between the cell partition wall 63 and the internal space of the second cell 61. Therefore, a translucent filler may be provided in the internal space of the first cell 51 of the first reinforcing material 50 and the internal space of the second cell 61 of the second reinforcing material 60 in the polarizer composite 40. preferable. In the first reinforcing material 50 and the second reinforcing material 60 of the polarizer composite 40, when gaps are provided between the plurality of first cells 51 or between the plurality of second cells 61, as described later, It is preferable that a translucent filler is also provided in this gap. Such fillers will be described later.

As used herein, translucency refers to the property (transmittance) of transmitting 80% or more of visible light in the wavelength range of 400 nm to 700 nm, preferably transmitting 85% or more, more preferably transmitting 90% or more. , 92% or more transmittance is more preferable. The definition of "translucency" below and the preferable range of transmittance for visible light are also the same as above.

(Polarizer composite (2))
FIG. 4 is a schematic cross-sectional view schematically showing another example of the polarizer composite of this embodiment. A polarizer composite 41 shown in FIG. 4 includes a polarizer 10, a retardation layer 71, a first reinforcing material 50, and a second reinforcing material 60. The polarizer composite 41 has a first reinforcing material 50 and a retardation layer 71 in this order on one surface of the polarizer 10, and a second reinforcing material 60 on the other surface of the polarizer 10. The polarizer 10, the retardation layer 71, the first reinforcing material 50, and the second reinforcing material 60 are as described above.

The retardation layer 71 can be provided on the opposite side of the first reinforcing material 50 from the polarizer 10 via a bonding layer (not shown). Examples of the bonding layer include the pressure-sensitive adhesive layer or the adhesive layer described in connection with the polarizer composite 40 above. It is preferable that the bonding layer interposed between the first reinforcing material 50 and the retardation layer 71 is also provided in the internal space of the first cell 51 of the first reinforcing material 50 . If the internal space of the first cell 51 of the first reinforcing member 50 is hollow, there is a possibility that the visibility of the display device may be reduced due to a difference in refractive index between the cell partition wall 53 and the internal space of the first cell 51. Therefore, by providing the material constituting the bonding layer interposed between the first reinforcing material 50 and the retardation layer 71 so as to fill the internal space of the first cell 51 of the first reinforcing material 50, the display device The reduction in visibility can be suppressed. When a gap is provided between the plurality of first cells 51 as described later, it is preferable that the material constituting the bonding layer is also provided in this gap.

The polarizer composite 41 may have one retardation layer 71 on the opposite side of the first reinforcing material 50 from the polarizer 10, or may have two or more retardation layers 71. Good too. When having two or more retardation layers, the retardation layers can be laminated with each other via a bonding layer, and the retardation characteristics may be the same or different from each other. In the case where the polarizer composite 41 further includes a retardation layer on the side opposite to the polarizer 10 side of the first reinforcing material 50, this retardation layer may be the retardation layer 71, and the entire retardation layer It may be a retardation layer (a retardation layer without a non-retardation layer) consisting of a region.

Similar to the polarizer composite 40 described above, the polarizer composite 41 further suppresses decreases in camera sensitivity and design by arranging printed parts such as camera lenses, icons, logos, etc. This makes it possible to suppress the occurrence of the above-mentioned problems. In addition, in the polarizer composite 41, since the first reinforcing material 50 and the second reinforcing material 60 are provided on both sides of the polarizer 10, cracks in the polarizer 10 may occur when subjected to temperature changes or impact. It is thought that this can prevent fine cracks from progressing to large cracks.

The thickness of the cured product of the curable resin (X) provided in the polarizer composite 41 is the same as the thickness of the layered structure portion including the retardation region 75, the polarization region 11, and the cell region 55 in the polarizer composite 40. (FIG. 4), may be smaller than the thickness of the layered structure portion, or may be larger than the thickness of the layered structure portion. The cured product of the curable resin (X) provided in the polarizer composite 41 covers at least a portion of the through hole 72 of the retardation layer 71, at least a portion of the through hole 22 of the polarizer 10, and the first reinforcing material. It is sufficient that the through hole 50 is provided so as to fill at least a portion of the through hole 52. The cured product of the curable resin (X) is preferably provided so as to fill the entire through hole 22 of the polarizer 10, and fills the entire through hole 72 of the retardation layer 71, the entire through hole 22 of the polarizer 10, and the entire through hole 22 of the polarizer 10. It is more preferable that the reinforcing member 1 is provided so as to fill the entire through hole 52 of the reinforcing member 50.

The thickness of the layered structure portion including the retardation region 75, the polarization region 11, and the cell region 55 in the polarizer composite 41 is preferably 30 μm or less, more preferably 25 μm or less, and 20 μm or less. is more preferable, and may be 18 μm or less, 16 μm or less, and usually 2 μm or more. If the thickness of the laminated structure portion exceeds the above range, the workability for providing a cured product of the curable resin (X) in the non-retardation area 76, the non-polarizing area 12, and the non-cell area 56 will be reduced as described below. tends to decline. Each thickness and the method for measuring the thickness are as described above.

The thickness of the cured product provided on the polarizer composite 41 may be measured by following the method for measuring the thickness of the cured product provided on the polarizer composite 40 described above. Specifically, in the above measurement method, the first plane is a plane including the surface of the retardation region 75 of the retardation layer 71 (the surface on the opposite side to the polarizer 10 side), and the curable resin (X) is What is necessary is to determine the thickness of the cured product.

The second reinforcing material 60 is applied to a display device or the like while being included in the polarizer composite 41. Therefore, as explained in the polarizer composite 40 above, a translucent filler is provided in the internal space of the second cell 61 of the second reinforcing material 60 and in the gap between the plurality of second cells 61. is preferred.

The first reinforcing material 50 and the second reinforcing material 60 of the polarizer composites 40 and 41 described above have the same shape and size as the first cell 51 and the second cell 61, respectively. They may be different from each other in at least one of shape and size. The openings of the first cells 51 of the first reinforcing material 50 provided in the polarizer 10 and the openings of the second cells 61 of the second reinforcing material 60 may be arranged so as to overlap each other in a plan view. , are preferably arranged so as to be offset from each other.

The polarizer composites 40 and 41 described above may be circularly polarizing plates. In this case, the retardation region 75 of the retardation layer 71 can have retardation characteristics that function as a quarter wavelength plate. When the polarizer composites 40 and 41 are circularly polarizing plates, one surface side of the polarizer 10 may have two or more retardation layers. For example, on one side of the polarizer 10, the retardation characteristics of the retardation region 75 are in the order of [a] 1/2 wavelength plate and 1/4 wavelength plate, [b] 1/4 wavelength of reverse wavelength dispersion. The retardation layer 71 may be stacked so that the positive C plate and the positive C plate are arranged in this order, or the [c] positive C plate and a reverse wavelength dispersion quarter wavelength plate are arranged in this order.

The polarizer composites 40 and 41 may be sheet bodies, or may be elongated bodies having a length that is wound into a roll shape during storage or transportation. The planar shape and size of the polarizer composites 40 and 41 are not particularly limited.

(Polarization area)
The polarizing region 11 of the polarizer 10 preferably exhibits absorption dichroism at a wavelength in the range of 380 nm to 780 nm. The polarizer 10 has the property of absorbing linearly polarized light having a vibration plane parallel to its absorption axis and transmitting linearly polarized light having a vibration plane perpendicular to the absorption axis (parallel to the transmission axis). This can be obtained mainly by the polarizing region 11.

The polarizing region 11 is made of a hydrophilic polymer film such as a polyvinyl alcohol film, a partially formalized polyvinyl alcohol film, or a partially saponified ethylene/vinyl acetate copolymer film, and a dichroic dye such as iodine or a dichroic dye. A dichroic substance is adsorbed and oriented on a polyene-based oriented film or a liquid crystal compound oriented, such as a dehydrated polyvinyl alcohol or a dehydrochloric acid treated polyvinyl chloride. things; etc. can be used. Among these, it is preferable to use one obtained by dyeing a polyvinyl alcohol film with iodine and uniaxially stretching the film as it has excellent optical properties.

First, a method for manufacturing the preferable polarizing region 11, which is obtained by dyeing a polyvinyl alcohol film with iodine and uniaxially stretching it, will be briefly described.

Staining with iodine is performed, for example, by immersing a polyvinyl alcohol film in an aqueous iodine solution. The stretching ratio for uniaxial stretching is preferably 3 to 7 times. Stretching may be carried out after the dyeing treatment or may be carried out while dyeing. Alternatively, it may be dyed after being stretched.

The polyvinyl alcohol film is subjected to swelling treatment, crosslinking treatment, washing treatment, drying treatment, etc. as necessary. For example, by immersing a polyvinyl alcohol film in water and washing it with water before dyeing, you can not only clean dirt and anti-blocking agents from the surface of the polyvinyl alcohol film, but also swell the polyvinyl alcohol film and dye it. Unevenness etc. can be prevented.

The stretching treatment, dyeing treatment, crosslinking treatment (boric acid treatment), water washing treatment, and drying treatment of the polyvinyl alcohol resin film may be performed according to the method described in JP-A-2012-159778, for example. In the method described in this document, a polyvinyl alcohol resin layer that becomes the polarizing region 11 is formed by coating a base film with a polyvinyl alcohol resin. At this time, the base film used can also be used as the first support layer 25 described later.

Next, the polarizing region 11, which is formed by adsorbing and aligning a dichroic dye to an aligned liquid crystal compound, will be briefly described. In this case, the polarizing region 11 may be a liquid crystal compound, as described in, for example, JP-A No. 2013-37353, JP-A No. 2013-33249, JP-A No. 2016-170368, and JP-A No. 2017-83843. A dichroic dye may be oriented in a cured film obtained by polymerization. As the dichroic dye, one having absorption within the wavelength range of 380 to 800 nm can be used, and it is preferable to use an organic dye. Examples of dichroic dyes include azo compounds. The liquid crystal compound is a liquid crystal compound that can be polymerized while being oriented, and can have a polymerizable group in the molecule. A cured film obtained by polymerizing such a liquid crystal compound may be formed on a base film, and in that case, the base film can also be used as the first support layer 25 described below.

It is also preferable to form the polarizer 10 by forming the non-polarizing region 12 by drilling after producing the polarizing film used for the polarizing region 11 as described above. In this specification, a polarizing film formed only of such polarizing regions 11 may be referred to as a raw material polarizer 20.

The visibility-corrected polarization degree (Py) of the polarization region 11 is preferably 80% or more, more preferably 90% or more, still more preferably 95% or more, and particularly preferably 99% or more. The single transmittance (Ts) of the polarizing region 11 is usually less than 50%, and may be 46% or less. The single transmittance (Ts) of the polarizing region 11 is preferably 39% or more, more preferably 39.5% or more, still more preferably 40% or more, particularly preferably 40.5% or more. .

The single transmittance (Ts) is a Y value measured in accordance with JIS Z8701 2-degree visual field (C light source) and subjected to visibility correction. Visibility correction polarization degree (Py) and single transmittance (Ts) can be measured using, for example, an ultraviolet-visible spectrophotometer (manufactured by JASCO Corporation, product name: V7100), and the visibility correction is performed. It is determined by the following formula based on the parallel transmittance Tp and the orthogonal transmittance Tc.
Py [%] = {(Tp-Tc)/(Tp+Tc)} ^1/2 ×100

(Non-polarized region)
Generally, "unpolarized light" refers to light that has no observable regularity in its electric field components. In other words, unpolarized light is random light in which no particular polarization state is observed to be dominant. Further, "partially polarized light" refers to light that is in an intermediate state between polarized light and unpolarized light, and means light that is a mixture of unpolarized light and at least one of linearly polarized light, circularly polarized light, and elliptically polarized light. The non-polarizing region 12 in the polarizer 10 means that the light (transmitted light) that passes through the non-polarizing region 12 becomes non-polarized light or partially polarized light. In particular, a non-polarized region where transmitted light is non-polarized light is preferred.

The non-polarizing region 12 of the polarizer 10 is an area surrounded by the polarizing region 11 in plan view. The non-polarizing region 12 contains a cured product of curable resin (X). The non-polarizing region 12 is formed by curing an active energy ray-curable resin composition containing a curable resin (X), which will be described later, in a through hole provided in a polarizer (raw material polarizer 20) formed only with the polarizing region 11. Preferably, it is equipped with a material. The non-polarizing region 12 has translucency.

Since the non-polarizing region 12 of the polarizer 10 has light-transmitting properties, a predetermined transparency can be ensured in the non-polarizing region 12. As a result, when applying the polarizer composites 40 and 41 to a display device, by arranging a printed part such as a camera lens, an icon, or a logo in correspondence with the non-polarizing area 12, it is possible to prevent a decrease in camera sensitivity. Decrease in design quality can be suppressed.

The planar shape of the non-polarizing region 12 is not particularly limited, but may include a circle; an ellipse; an oval shape; a polygon such as a triangle or a quadrangle; a polygon in which at least one corner is rounded (a shape having an R); It can be a polygon, etc.

The diameter of the non-polarizing region 12 is preferably 0.5 mm or more, may be 1 mm or more, may be 2 mm or more, or may be 3 mm or more. The diameter of the non-polarizing region 12 is preferably 20 mm or less, may be 15 mm or less, may be 10 mm or less, or may be 7 mm or less. The diameter of the non-polarizing region 12 refers to the length of the longest straight line connecting any two points on the outer periphery of the non-polarizing region 12.

The thickness of the cured product of the curable resin (X) provided in the non-polarizing region 12 may be the same as the thickness of the polarizing region 11, or may be smaller than the thickness of the polarizing region 11. It may be larger than the thickness. As described above, the cured product of the curable resin (X) provided in the non-polarizing region 12 is preferably provided so as to fill the entire through hole 22 .

The thickness of the cured material provided in the non-polarizing region 12 may be measured by following the method for measuring the thickness of the cured material provided in the polarizer composite 40 described above. Specifically, in the above measurement method, the second plane is the surface of the polarizing region 11 of the polarizer 10 that is opposite to the surface included in the first plane, and the curable resin (X) is What is necessary is to determine the thickness of the cured product.

(Cell area of first reinforcing material)
The cell region 55 is a region where the first cells 51 of the first reinforcing material 50 are present. As shown in FIG. 1B, the first cell 51 has a hollow columnar (cylindrical) structure surrounded by cell partition walls 53 that partition the first cell 51, and both axial ends of the columnar structure are It has an open end surface. The first cell 51 has a first opening end surface disposed on a side relatively close to the polarizer 10 of the polarizer composites 40 and 41, and a second opening end surface disposed on a relatively far side. It has two open end faces. The cell region 55 only needs to be arranged such that at least one of the first opening end surface and the second opening end surface faces the polarizer 10, and both the first opening end surface and the second opening end surface It is preferable that they are arranged so as to face the child 10.

Although the shape of the opening of the first cell 51 of the cell region 55 is not particularly limited, it is preferably polygonal, circular, or elliptical. The shape of the opening on the first opening end surface and the shape of the opening on the second opening end surface are preferably the same size and shape, but may be different shapes, or may be the same shape and size. May be different. Moreover, the shapes of the openings of the plurality of first cells 51 included in the cell region 55 may be the same or different from each other.

The plurality of first cells 51 included in the cell region 55 are preferably arranged such that the openings of the first cells 51 are adjacent to each other in a plan view of the opening end surface. The plurality of first cells 51 are arranged so that, in a plan view of the opening end surface, the first cells 51 are arranged without gaps between each other, as in the case where the opening of the first cells 51 has a hexagonal shape, for example, as shown in FIG. 1(b). They may be arranged in such a way that they are arranged. Alternatively, the plurality of first cells 51 may be partially in contact with the cell partition walls 53 of the plurality of first cells 51, as in the case where the shape of the opening of the first cell 51 is circular or the like in a plan view of the opening end surface. The plurality of first cells 51 may be arranged with gaps between them.

As shown in FIG. 1B, for example, the cell region 55 of the first reinforcing material 50 has a hexagonal opening in both the first opening end surface and the second opening end surface, and the polarizer composite 40, It is preferable to have a honeycomb structure in which a plurality of first cells 51 are arranged such that the openings are arranged adjacent to each other without any gaps in the plane direction of 41 .

Although the size of the opening of the first cell 51 is not particularly limited, it is preferable to have a diameter smaller than the diameter of the non-polarizing region 12. The diameter of the first cell 51 is preferably 3 mm or less, may be 2 mm or less, may be 1 mm or less, and is usually 0.1 mm or more, and may be 0.5 mm or more. . The diameter of the opening of the first cell 51 refers to the length of the longest straight line connecting any two points on the outer periphery of the opening.

The height of the first cell 51 (the length in the direction perpendicular to the opening end surface of the first cell 51) is usually 0.1 μm or more, may be 0.5 μm or more, or may be 1 μm or more. , 3 μm or more, and usually 15 μm or less, 13 μm or less, or 10 μm or less.

It is preferable that the cell partition walls 53 that partition the first cells 51 of the cell region 55 have translucency.

The line width of the cell partition walls 53 in the cell region 55 is, for example, 0.05 mm or more, may be 0.1 mm or more, may be 0.5 mm or more, may be 1 mm or more, and It is usually 5 mm or less, and may be 3 mm or less.

The cell partition walls 53 of the cell region 55 can be formed of, for example, a resin material or an inorganic oxide, and are preferably formed of a resin material. Examples of the resin material include curable resins such as thermoplastic resins, thermosetting resins, and active energy ray curable resins. Examples of the resin material include the above-mentioned curable resin (X); the thermoplastic resin exemplified as the thermoplastic resin used for the filler, and the like. Examples of the inorganic oxide include silicon oxide (SiO ₂ ), aluminum oxide, and the like.

(Non-cell area of first reinforcement)
The non-cell area 56 is an area where the first cell 51 of the first reinforcing material 50 does not exist, and as described above, the cell partition wall 53 that constitutes the first cell 51 and the hollow columnar (cylindrical) area surrounded by the cell partition wall 53. This is an area where no space exists. The non-cell region 56 is provided so as to cut out all or part of the plurality of first cells 51, and has a through hole 52 provided in a region corresponding to the through hole 22 of the polarizer 10. The non-cell region 56 can contain a cured product of the curable resin (X) in the through hole 52 .

The planar shape and diameter of the non-cell region 56 are not particularly limited, and include the shape and diameter illustrated as the planar shape of the non-polarizing region 12. The planar shape and diameter of the non-cell region 56 are preferably the same as the planar shape and diameter of the non-polarizing region 12.

(Second reinforcement material)
As shown in FIG. 1(c), the second cells 61 of the second reinforcing material 60 have a hollow columnar (cylindrical) structure surrounded by cell partition walls 63 that partition the second cells 61. Both axial ends of the structure are open end faces. The second cell 61 is disposed as an open end face on a side relatively far from the first ′ open end face, which is disposed on a side relatively close to the polarizer 10 of the polarizer composites 40 and 41. and a 2' open end surface. The second reinforcing material 60 only needs to be arranged so that at least one of the 1' opening end surface and the 2' opening end surface faces the polarizer 10, and the 1' opening end surface and the 2' opening end surface It is preferable that both end faces are arranged so as to face the polarizer 10.

Examples of the shape of the openings of the second cells 61 of the second reinforcing material 60 include those exemplified in the shape of the openings of the first cells 51. The shape of the opening on the first opening end face and the shape of the opening on the second opening end face are preferably the same size and shape, but they may be different shapes, or they may be the same shape but large. The size may be different. Further, the shapes of the openings of the plurality of second cells 61 may be the same or different from each other.

It is preferable that the plurality of second cells 61 of the second reinforcing member 60 are arranged so that the openings of the second cells 61 are adjacent to each other in a plan view of the opening end surface. The plurality of second cells 61 are arranged so that, in a plan view of the opening end surface, the second cells 61 are arranged without gaps between each other, as in the case where the shape of the opening of the second cells 61 is hexagonal or the like as shown in FIG. 1(c), for example. They may be arranged in such a way that they are arranged. Alternatively, the plurality of second cells 61 may be partially in contact with the cell partition walls 63 of the plurality of second cells 61, as in the case where the shape of the opening of the second cells 61 is circular or the like in a plan view of the opening end surface. The plurality of second cells 61 may be arranged with gaps between them.

As shown in FIG. 1C, for example, the second reinforcing material 60 has a hexagonal opening in both the first ′ opening end face and the second ′ opening end face, and the opening is in a hexagonal shape in the plane direction of the polarizer composite 40. In this case, it is preferable to have a honeycomb structure in which a plurality of second cells 62 are arranged so that the openings are arranged adjacent to each other without any gaps.

The size and height of the opening of the second cell 62 can be, for example, the size and height illustrated for the opening of the first cell 52. The translucency, line width, and material of the cell partition walls 63 that partition the second cells 61 of the second reinforcing material 60 are, for example, the translucency, line width, and material illustrated for the cell partition walls 53 that partition the first cells 51. and materials.

(phase difference region)
The retardation layer 71 has a retardation property, and this property can be obtained mainly by the retardation region 75. At least one of the in-plane retardation value (R0) and the thickness direction retardation value (Rth) at a wavelength of 590 nm of the retardation region 75 is more than 40 nm, and each may independently be 100 nm or more, It may be 500 nm or more, 1000 nm or more, and usually 15000 nm or less.

The retardation region 75 can have retardation characteristics that function as, for example, a quarter-wave plate, a half-wave plate, a quarter-wave plate with reverse wavelength dispersion, or a positive C plate. As described above, the retardation region 75 can be formed by stacking a plurality of types of retardation layers having mutually different retardation characteristics.

The retardation region 75 can be a region formed by a raw material retardation layer whose entirety is a retardation region, which will be described later. In the case where the retardation region 75 is formed by laminating a plurality of types of retardation layers having mutually different retardation characteristics, the layer formed by laminating the plurality of types may be used as the raw material retardation layer. Therefore, the retardation region 75 is formed of a material constituting a raw material retardation layer to be described later, and specifically can include a thermoplastic resin. The retardation region can be formed by, for example, a stretched film obtained by uniaxially or biaxially stretching a thermoplastic resin, a polymerized and cured layer of a polymerizable liquid crystal compound, or the like.

The thickness of the retardation region 75 is preferably 15 μm or less, may be 13 μm or less, may be 10 μm or less, may be 8 μm or less, may be 5 μm or less, and is usually 1 μm or less. That's all.

(Non-phase difference region)
The non-retardation region 76 of the retardation layer 71 is a region surrounded by the retardation region 75 in plan view. The in-plane retardation value (R0) and the thickness direction retardation value (Rth) at a wavelength of 590 nm of the non-retardation region 76 are 40 nm or less, each independently may be 35 nm or less, and may be 30 nm or less. The thickness may be 20 nm or less, or 0 nm.

The non-retardation region 76 can contain a cured product of the curable resin (X) in the through hole 72 surrounded by the retardation region 75 in plan view. The thickness of the cured product of the curable resin (X) provided in the non-retardation region 76 may be the same as the thickness of the retardation region 75, or may be smaller than the thickness of the non-retardation region 76, The thickness may be greater than the thickness of the non-retardation region 76. As described above, the cured product of the curable resin (X) provided in the non-retardation region 76 is preferably provided so as to fill the entire through hole 72 . As will be described later, by providing such a non-retardation region 76 in correspondence with the non-polarizing region 12, when applying the polarizer composites 40, 41 to a display device, the non-polarizing region 12 and the non-polarizing region 12 can be By arranging a printed portion such as a camera lens, an icon, or a logo in correspondence with the phase difference region 76, it is possible to suppress a decrease in camera sensitivity and a decrease in design.

The thickness of the cured material provided in the non-retardation region 76 may be measured by following the method for measuring the thickness of the cured material provided in the polarizer composite 40 described above. Specifically, in the above measurement method, the thickness of the cured product of the curable resin (X) is determined by using the first plane and the second plane as one surface and the other surface of the retardation region 75 of the retardation layer 71, respectively. All you have to do is decide.

The planar shape and diameter of the non-retardation region 76 are not particularly limited, and include the shape and diameter illustrated as the planar shape of the non-polarizing region 12. The planar shape and diameter of the non-retardation region 76 are preferably the same as the planar shape and diameter of the non-polarizing region 12, respectively.

(Active energy ray curable resin (curable resin (X)))
As described above, the non-polarizing region 12, the non-cell region 56, and the non-retardation region 76 in the polarizer composites 40, 41 are provided with a cured product of active energy ray-curable resin (curable resin (X)). It is preferably formed of an active energy ray-curable resin composition (hereinafter sometimes referred to as "curable resin composition") containing the curable resin (X). The curable resin (X) contained in the curable resin composition is one that is cured by irradiation with active energy rays such as ultraviolet rays, visible light, electron beams, and X-rays. The curable resin (X) is preferably an ultraviolet curable resin that is cured by irradiation with ultraviolet rays. The curable resin composition containing the curable resin (X) may be an active energy ray-curable adhesive, and in this case, it is more preferably an ultraviolet ray-curable adhesive.

It is preferable that the curable resin composition is solvent-free. Solvent-free type means that no solvent is actively added. Specifically, a solvent-free curable resin composition refers to the curable resin ( X) It means that the solvent content is 5% by weight or less based on 100% by weight.

It is preferable that the curable resin (X) contains an epoxy compound. An epoxy compound is a compound having one or more, preferably two or more, epoxy groups in the molecule. Examples of the epoxy compound include alicyclic epoxy compounds, aliphatic epoxy compounds, hydrogenated epoxy compounds (glycidyl ether of polyols having an alicyclic ring), and the like. The number of epoxy compounds contained in the curable resin (X) may be one, or two or more.

The content of the epoxy compound is preferably 40% by weight or more, more preferably 50% by weight or more, and still more preferably 60% by weight or more based on 100% by weight of the curable resin (X). preferable. The content of the epoxy compound may be 100% by weight or less, may be 90% by weight or less, and may even be 80% by weight or less, based on 100% by weight of the curable resin (X). However, it may be 75% by weight or less.

The epoxy equivalent weight of the epoxy compound is usually within the range of 40 to 3000 g/equivalent, preferably 50 to 1500 g/equivalent. When the epoxy equivalent exceeds 3000 g/equivalent, the compatibility with other components contained in the curable resin (X) may decrease.

The epoxy compound contained in the curable resin (X) preferably contains an alicyclic epoxy compound. Alicyclic epoxy compounds are epoxy compounds that have one or more epoxy groups bonded to an alicyclic ring in the molecule. "Epoxy group bonded to an alicyclic ring" means a bridging oxygen atom -O- in the structure shown in the following formula. In the following formula, m is an integer from 2 to 5.

A compound in which a group in which one or more hydrogen atoms in (CH ₂ ) _m in the above formula are removed is bonded to another chemical structure can be an alicyclic epoxy compound. One or more hydrogen atoms in (CH ₂ ) _m may be appropriately substituted with a linear alkyl group such as a methyl group or an ethyl group. Among alicyclic epoxy compounds, epoxy compounds having an oxabicyclohexane ring (m = 3 in the above formula) or an oxabicycloheptane ring (m = 4 in the above formula) are suitable for the polarization region of the polarizer 10. 11. Curing resin (X) forming the retardation region 75 of the retardation layer 71 and the cell region 55 of the first reinforcing material 50, the non-polarizing region 12, the non-retardation region 76, and the non-cell region 56. It is preferably used because it provides excellent adhesion to the cured product. Specific examples of alicyclic epoxy compounds that are preferably used are shown below, but the present invention is not limited to these compounds.

［式（ＩＶ）中、Ｒ^８及びＲ^９は、互いに独立して、水素原子又は炭素数１～５の直鎖状アルキル基を表す。］ [a] Epoxycyclohexylmethyl epoxycyclohexane carboxylates represented by the following formula (IV):

[In formula (IV), R ⁸ and R ⁹ each independently represent a hydrogen atom or a linear alkyl group having 1 to 5 carbon atoms. ]

［式（Ｖ）中、Ｒ^１０及びＲ^１１は、互いに独立して、水素原子又は炭素数１～５の直鎖状アルキル基を表し、ｎは２～２０の整数を表す。］ [b] Epoxycyclohexane carboxylates of alkanediol represented by the following formula (V):

[In formula (V), R ¹⁰ and R ¹¹ independently represent a hydrogen atom or a linear alkyl group having 1 to 5 carbon atoms, and n represents an integer of 2 to 20. ]

［式（ＶＩ）中、Ｒ^１２及びＲ^１３は、互いに独立して、水素原子又は炭素数１～５の直鎖状アルキル基を表し、ｐは２～２０の整数を表す。］ [c] Epoxycyclohexylmethyl esters of dicarboxylic acid represented by the following formula (VI):

[In formula (VI), R ¹² and R ¹³ independently represent a hydrogen atom or a linear alkyl group having 1 to 5 carbon atoms, and p represents an integer of 2 to 20. ]

［式（ＶＩＩ）中、Ｒ^１４及びＲ^１５は、互いに独立して、水素原子又は炭素数１～５の直鎖状アルキル基を表し、ｑは２～１０の整数を表す。］ [d] Epoxycyclohexyl methyl ethers of polyethylene glycol represented by the following formula (VII):

[In formula (VII), R ¹⁴ and R ¹⁵ each independently represent a hydrogen atom or a linear alkyl group having 1 to 5 carbon atoms, and q represents an integer of 2 to 10. ]

［式（ＶＩＩＩ）中、Ｒ^１６及びＲ^１７は、互いに独立して、水素原子又は炭素数１～５の直鎖状アルキル基を表し、ｒは２～２０の整数を表す。］ [e] Epoxycyclohexyl methyl ethers of alkanediol represented by the following formula (VIII):

[In formula (VIII), R ¹⁶ and R ¹⁷ each independently represent a hydrogen atom or a linear alkyl group having 1 to 5 carbon atoms, and r represents an integer of 2 to 20. ]

［式（ＩＸ）中、Ｒ^１８及びＲ^１９は、互いに独立して、水素原子又は炭素数１～５の直鎖状アルキル基を表す。］ [f] Diepoxytrispiro compound represented by the following formula (IX):

[In formula (IX), R ¹⁸ and R ¹⁹ each independently represent a hydrogen atom or a linear alkyl group having 1 to 5 carbon atoms. ]

［式（Ｘ）中、Ｒ^２０及びＲ^２１は、互いに独立して、水素原子又は炭素数１～５の直鎖状アルキル基を表す。］ [g] Diepoxy monospiro compound represented by the following formula (X):

[In formula (X), R ²⁰ and R ²¹ independently represent a hydrogen atom or a linear alkyl group having 1 to 5 carbon atoms. ]

［式（ＸＩ）中、Ｒ^２２は、水素原子又は炭素数１～５の直鎖状アルキル基を表す。］ [h] Vinylcyclohexene diepoxides represented by the following formula (XI):

[In formula (XI), R ²² represents a hydrogen atom or a linear alkyl group having 1 to 5 carbon atoms. ]

［式（ＸＩＩ）中、Ｒ^２３及びＲ^２４は、互いに独立して、水素原子又は炭素数１～５の直鎖状アルキル基を表す。］ [i] Epoxycyclopentyl ethers represented by the following formula (XII):

[In formula (XII), R ²³ and R ²⁴ each independently represent a hydrogen atom or a linear alkyl group having 1 to 5 carbon atoms. ]

［式（ＸＩＩＩ）中、Ｒ^２５は、水素原子又は炭素数１～５の直鎖状アルキル基を表す。］ [j] Diepoxytricyclodecane represented by the following formula (XIII):

[In formula (XIII), R ²⁵ represents a hydrogen atom or a linear alkyl group having 1 to 5 carbon atoms. ]

Examples of aliphatic epoxy compounds include polyglycidyl ethers of aliphatic polyhydric alcohols or alkylene oxide adducts thereof. More specifically, diglycidyl ether of 1,4-butanediol; diglycidyl ether of 1,6-hexanediol; triglycidyl ether of glycerin; triglycidyl ether of trimethylolpropane; diglycidyl ether of polyethylene glycol; propylene Diglycidyl ether of glycol; polyglycidyl of polyether polyol obtained by adding one or more alkylene oxides (ethylene oxide or propylene oxide) to aliphatic polyhydric alcohol such as ethylene glycol, propylene glycol or glycerin. Examples include ether.

The hydrogenated epoxy compound is obtained by reacting epichlorohydrin with an alicyclic polyol obtained by hydrogenating the aromatic ring of an aromatic polyol. Examples of aromatic polyols include bisphenol type compounds such as bisphenol A, bisphenol F, and bisphenol S; novolak type resins such as phenol novolak resin, cresol novolak resin, and hydroxybenzaldehyde phenol novolak resin; tetrahydroxydiphenylmethane, tetrahydroxybenzophenone, polyvinylphenol, etc. Examples include polyfunctional compounds. Among the hydrogenated epoxy compounds, hydrogenated diglycidyl ether of bisphenol A is preferred.

The curable resin (X) may contain a (meth)acrylic compound or the like together with an active energy ray-curable compound such as an epoxy compound. By using a (meth)acrylic compound in combination, the polarizing region 11 of the polarizer 10, the retardation region 75 of the retardation layer 71, the cell region 55 of the first reinforcing material 50, the non-polarizing region 12, the non-retardation It can be expected to have the effect of increasing the adhesion between the region 76 and the cured product of the curable resin (X) forming the non-cell region 56, and the hardness and mechanical strength of the cured product of the curable resin (X). This makes it easier to adjust the viscosity, curing speed, etc. of the curable resin (X). "(Meth)acrylic" means at least one selected from the group consisting of acrylic and methacryl.

The curable resin composition containing the curable resin (X) preferably contains a polymerization initiator. Examples of the polymerization initiator include cationic polymerization agents such as photocationic polymerization agents and radical polymerization initiators. The photocationic polymerization initiator generates cationic species or Lewis acids upon irradiation with active energy rays such as visible light, ultraviolet rays, X-rays, and electron beams, and initiates the polymerization reaction of epoxy groups. As mentioned above, the curable resin (X) is preferably an ultraviolet curable resin that is cured by irradiation with ultraviolet rays, and the curable resin (X) preferably contains an alicyclic epoxy compound. The polymerization initiator is preferably one that generates a cationic species or a Lewis acid upon irradiation with ultraviolet rays.

The curable resin composition further contains a photosensitizer, a polymerization accelerator, an ion trapping agent, an antioxidant, a chain transfer agent, a tackifier, a thermoplastic resin, a filler, a flow regulator, a plasticizer, and an antifoaming agent. It may contain additives such as antistatic agents, antistatic agents, and leveling agents.

(filling material)
The filler that may be provided in the first reinforcing material 50 and the second reinforcing material 60 has translucency, and the filler material is translucent, and the inner space of the first cell 51 of the first reinforcing material 50 and the second cell 61 of the second reinforcing material 60 are transparent. There is no particular limitation as long as it can fill the internal space. The filler is preferably a material different from the material forming the cell partition walls 53 of the first reinforcing material 50 and the cell partition walls 63 of the second reinforcing material 60, and preferably contains a resin material. Examples of the resin material include one or more selected from the group consisting of thermoplastic resins, thermosetting resins, curable resins such as active energy ray-curable resins, and adhesives or adhesives. Good too.

Examples of thermoplastic resins include polyolefin resins such as chain polyolefin resins (polypropylene resins, etc.) and cyclic polyolefin resins (norbornene resins, etc.); cellulose ester resins such as triacetyl cellulose and diacetyl cellulose; polyethylene terephthalate; Polyester resins such as polyethylene naphthalate and polybutylene terephthalate; polycarbonate resins; (meth)acrylic resins; polystyrene resins; polyether resins; polyurethane resins; polyamide resins; polyimide resins; fluorine resins, etc. Can be mentioned.

Examples of the curable resin include the above-mentioned curable resin (X).

An adhesive exhibits adhesive properties by pasting itself onto an adherend, and is a so-called pressure-sensitive adhesive. Examples of the adhesive include those containing polymers such as (meth)acrylic polymers, silicone polymers, polyester polymers, polyurethane polymers, polyether polymers, or rubber polymers as a main component. In this specification, the main component refers to a component containing 50% by mass or more of the total solid content of the adhesive. The adhesive may be of an active energy ray-curable type or a thermosetting type, and the degree of crosslinking and adhesive strength may be adjusted by irradiation with active energy rays or heating.

The adhesive contains a curable resin component and is an adhesive other than a pressure-sensitive adhesive (adhesive). Examples of the adhesive include water-based adhesives in which a curable resin component is dissolved or dispersed in water, active energy ray-curable adhesives containing active energy ray-curable compounds, thermosetting adhesives, and the like.

As the adhesive, a water-based adhesive commonly used in the technical field of polarizing plates can also be used. Examples of resin components contained in the water-based adhesive include polyvinyl alcohol resins and urethane resins. Examples of active energy ray-curable adhesives include compositions that are cured by irradiation with active energy rays such as ultraviolet rays, visible light, electron beams, and X-rays. As the active energy ray-curable adhesive, a curable resin composition containing the above-mentioned curable resin (X) may be used. Examples of thermosetting adhesives include those containing epoxy resins, silicone resins, phenol resins, melamine resins, etc. as main components.

(Method for manufacturing polarizer composite (1))
5 to 7 are schematic cross-sectional views schematically showing an example of a method for manufacturing the polarizer composite 40 (FIG. 1(a)). 5 to 7 show the case where the polarizer composite 40 shown in FIG. 1(a) is obtained, but the polarizer composite 40 shown in FIGS. 2(a) and (b) will also be described below. It can be manufactured by a method. The polarizer composite 40 includes, for example, a raw material polarizer 20 (FIG. 5(a)) that has the same visibility correction degree of polarization (Py) as a whole and does not have a non-polarizing region 12, and a raw material retardation layer. A polymerized hardened layer 85 (FIG. 5(b)) whose entirety is a retardation region, and a reinforcing material forming structure 58 (hereinafter referred to as “structure 58 ).

Since the raw material polarizer 20 is formed only from the polarizing region 11 of the polarizer 10 described above, the thickness of the raw material polarizer 20 is preferably 15 μm or less, which is the same thickness as the polarizing region 11 of the polarizer 10. Since the polymerized hardened layer 85 becomes the retardation region 75 of the above-described retardation layer 71, the thickness of the polymerized hardened layer 85 is preferably the same as the thickness of the retardation region 75 of the retardation layer 71. Since the structure 58 becomes the cell region 55 of the first reinforcing material 50 described above, it is preferable that it has the same thickness as the cell region 55 of the first reinforcing material 50.

The polarizer composite 40 can be manufactured, for example, by the following process. First, a first support layer 25 is provided on one surface of the raw material polarizer 20 so as to be removable from the raw material polarizer 20 (FIG. 5(a)). A polymerizable liquid crystal compound is polymerized and cured on the base material layer 84 to prepare a polymerized and cured layer 80 with a base material layer, in which a polymerized and cured layer 85 that is entirely a retardation region is formed on the base material layer 84 ( Figure 5(b)). The polymerized cured layer 85 side of the polymerized cured layer 80 with a base material layer is laminated on the raw material polarizer 20 on the first support layer 25 via a bonding layer (not shown) (FIG. 5(c)). The layer 84 is peeled off (FIG. 5(d)). A structure 58 is formed on the surface exposed by peeling off the base material layer 84 (the surface on the polymerized and cured layer 85 side) (FIG. 6(a)). As a result, a first laminate 31 is obtained in which the structure 58, the polymerized cured layer 85, the raw material polarizer 20, and the first support layer 25 are laminated in this order (FIG. 6(a)). The structure 58 can be obtained by forming cell partition walls 53 that partition the first cells 51 on the surface of the polymerized cured layer 85 using, for example, a resin material or an inorganic oxide.

Methods for forming the cell partition walls 53 using a resin material are not particularly limited, but include, for example, printing methods such as inkjet printing, screen printing, and gravure printing; photolithography methods; coating methods using nozzles, dies, etc. It will be done. In the above method, a resin composition in which a resin material is mixed with a solvent, an additive, etc. may be used. Examples of additives include leveling agents, antioxidants, plasticizers, tackifiers, organic or inorganic fillers, pigments, anti-aging agents, ultraviolet absorbers, antioxidants, and the like. The cell partition walls 53 may be formed by subjecting a printed or applied resin composition to solidification or curing treatment, if necessary.

Although the method of forming the cell partition 53 using an inorganic oxide is not particularly limited, it can be formed, for example, by vapor deposition of an inorganic oxide.

A through hole 32 penetrating in the stacking direction is formed in the first stacked body 31 by punching, cutting, cutting, laser cutting, or the like (FIG. 6(b)). As a result, through holes 52 are formed in the perforated polarizer 21 in which the through holes 22 are formed in the raw material polarizer 20, in the perforated retardation layer 81 in which the through holes 72 are formed in the polymerized and cured layer 85, and in the structure 58. A formed perforated structure 59 is obtained. The second support layer 26 is laminated on the perforated structure 59 side (the side opposite to the perforated retardation layer 81) of the first laminate 31 in which the through holes 32 are formed (FIG. 6(c)). The second support layer 26 is provided so as to close one side of the through hole 72 of the perforated retardation layer 81 .

After that, the first support layer 25 is peeled off (FIG. 7(a)), and the through holes 22 of the perforated polarizer 21, the through holes 72 of the perforated retardation layer 81, and the through holes 52 of the perforated structure 59 are removed. By filling a curable resin composition containing a curable resin (X) and irradiating it with active energy rays, the curable resin (X) in the through holes 22, 72, and 52 is cured, thereby forming a perforated polarizer. A cured product of the curable resin (X) is formed in the through holes 22 of No. 21, the through holes 72 of the perforated retardation layer 81, and the through holes 52 of the perforated structure 59 (FIG. 7(b)). As a result, a cured product of the curable resin (X) is formed in the through holes 22 of the perforated polarizer 21, the through holes 72 of the perforated retardation layer 81, and the through holes 52 of the perforated structure 59, and the second The first reinforcing material 50, retardation layer 71, and polarizer 10 are formed in this order on the support layer 26 (FIG. 7(b)). In the polarizer 10 shown in FIG. 7(b), the area other than the through holes 22 of the perforated polarizer 21 becomes the polarizing area 11, and the area of the through hole 22 provided with the cured material becomes the non-polarizing area 12. It is. In the retardation layer 71 shown in FIG. 7B, the region other than the through holes 72 of the perforated retardation layer 81 becomes a retardation region 75, and the region of the through hole 72 provided with the cured material becomes a non-retardation region 76. This is what became. The first reinforcing material 50 shown in FIG. 7(b) is provided on one side of the polarizer 10, and the area other than the through holes 52 of the perforated structure 59 becomes the cell area 55, and the cured material is provided. The area of the through hole 52 becomes a non-cell area 56.

Subsequently, a second reinforcing material 60 is formed on the opposite side of the polarizer 10 from the retardation layer 71 side, and a polarizer composite 40 is formed on the second support layer 26 (FIG. 5(c)). . The cell partition walls 63 of the second reinforcing material 60 may be formed by, for example, the method described in the method for forming the cell partition walls 53 of the structure 58 described above. After forming the second reinforcing material 60, the second support layer 26 may be peeled off.

The method for filling the through holes 22 of the perforated polarizer 21, the through holes 72 of the perforated retardation layer 81, and the through holes 52 of the perforated structure 59 with the curable resin composition is not particularly limited. For example, the curable resin composition may be injected into the through holes 22, 72, 52 using a dispenser or dispenser, etc., and while coating the perforated structure 59 with the curable resin composition, 22, 72, and 52 may be filled with a curable resin composition.

The first support layer 25 may be a support layer used when manufacturing the raw material polarizer 20 described later, or the above-mentioned base film used when coating the curable resin composition. Alternatively, it may be a removable support layer bonded to the raw material polarizer 20 using a volatile liquid such as water, or an adhesive sheet that can be peeled off from the raw material polarizer 20. Examples of the method for providing the second support layer 26 include the methods exemplified as the method for providing the first support layer 25.

As described above, since the thickness of the raw material polarizer 20 is 15 μm or less, the depth of the through holes 22 provided in the perforated polarizer 21 can also be 15 μm or less. As explained in the polarizer composite 40, the thickness of the laminated structure portion including the polarizing region 11, the retardation region 75, and the cell region 55 in the polarizer composite 40 is preferably 30 μm or less, so the raw material retardation The total thickness of the polymerized hardened layer 85 and the structure 58 is also preferably 15 μm or less. Thereby, the total depth of the through holes 22, 72, and 52 can be set to 30 μm or less. Therefore, the through holes 22 of the perforated polarizer 21, the through holes 72 of the perforated retardation layer 71, and the through holes 52 of the perforated structure 59 can be filled with the curable resin composition, and the through holes 22, 72, The curing treatment of the curable resin (X) contained in the curable resin composition filled in 52 can be performed in a short time.

(Method for manufacturing polarizer composite (2))
8 to 11 are schematic cross-sectional views schematically showing an example of a method for manufacturing the polarizer composite 41 (FIG. 4). 8 to 11 show the case where the polarizer composite 41 shown in FIG. 4 is obtained. The polarizer composite 41 can be manufactured using the raw polarizer 20, the polymerized cured layer 85, and the structure 58 used in manufacturing the polarizer composite 40 described above.

The polarizer composite 41 can be manufactured, for example, by the following process. First, the first support layer 25 is provided on one surface of the raw material polarizer 20 so as to be removable from the raw material polarizer 20, and then the first support layer 25 is provided on one surface of the raw material polarizer 20, and then A structure 58 is formed to prepare the second laminate 33 (FIG. 8(a)). Structure 58 can be formed by the method described above. A polymerizable liquid crystal compound is polymerized and cured on the base material layer 84 to prepare a polymerized and cured layer 80 with a base material layer, in which a polymerized and cured layer 85 that is entirely a retardation region is formed on the base material layer 84 ( Figure 8(b)).

The polymerized cured layer 85 side of the polymerized cured layer 80 with a base material layer is laminated on the structure 58 side of the prepared second laminate 33 via a bonding layer (not shown) (FIG. 8(c)). At this time, the bonding layer is preferably provided so as to enter the internal space of the first cell 51 of the structure 58 and the gaps between the plurality of first cells 51. Thereby, a third laminate 34 is obtained in which the base material layer 84, the polymerized cured layer 85, the structure 58, the raw material polarizer 20, and the first support layer 25 are laminated in this order (FIG. 8(c)). A through hole 35 penetrating in the stacking direction is formed in the third laminate 34 by punching, cutting, cutting, laser cutting, etc. (FIG. 8(d)), and the base material layer 84 is peeled off (FIG. 8(d)). e)). As a result, the perforated polarizer 21 in which the through holes 22 are formed in the raw material polarizer 20, the perforated structure 59 in which the through holes 52 are formed in the structure 58, and the through holes 72 in the polymerized and cured layer 85 are formed. A perforated retardation layer 81 is obtained.

Subsequently, the third support layer 27 is laminated on the side exposed by peeling off the base material layer 84 (the perforated retardation layer 81 side) (FIG. 9(a)), and the first support layer 25 is peeled off (FIG. 9(a)). 9(b)). The third support layer 76 is provided so as to close one side of the through hole 72 of the perforated retardation layer 81 . Thereafter, the through holes 22 of the perforated polarizer 21, the through holes 52 of the perforated structure 59, and the through holes 72 of the perforated retardation layer 81 are filled with a curable resin composition containing the curable resin (X). By irradiating active energy rays, the curable resin (X) in the through holes 22, 52, and 72 is cured to form the through holes 22 of the perforated polarizer 21, the through holes 52 of the perforated structure 59, Then, a cured product of the curable resin (X) is formed in the through holes 72 of the perforated retardation layer 81 (FIG. 9(c)). Thereby, the retardation layer 71, the first reinforcing material 50, and the polarizer 10 are formed in this order on the third support layer 27 (FIG. 9(c)). In the retardation layer 71 shown in FIG. 9(c), the region other than the through holes 72 of the perforated retardation layer 81 becomes a retardation region 75, and the region of the through hole 72 provided with the cured material becomes a non-retardation region 76. This is what became. The first reinforcing material 50 shown in FIG. 9(c) is provided on one side of the polarizer 10, and the area other than the through holes 52 of the perforated structure 59 becomes the cell area 55, and the cured material is provided. The area of the through hole 52 becomes a non-cell area 56. In the polarizer 10 shown in FIG. 9(c), the area other than the through-holes 22 of the perforated polarizer 21 becomes the polarizing area 11, and the area of the through-hole 22 provided with the cured material becomes the non-polarizing area 12. It is.

Subsequently, a second reinforcing material 60 is formed on the opposite side of the polarizer 10 from the first reinforcing material 50 side, and a polarizer composite 40 is formed on the third support layer 27 (FIG. 9(d)). ). The cell partition walls 63 of the second reinforcing material 60 may be formed by, for example, the method described in the method for forming the cell partition walls 53 of the structure 58 described above. After forming the second reinforcing material 60, the third support layer 27 may be peeled off.

As a method for filling the through holes 22 of the perforated polarizer 21, the through holes 52 of the perforated structure 59, and the through holes 72 of the perforated retardation layer 81 with the curable resin composition, The filling method explained in the manufacturing method can be mentioned. The through holes 22, 52, and 72 may be filled with the curable resin composition while coating the surface of the perforated polarizer 21 with the curable resin composition. Examples of the method for providing the third support layer 27 include the methods exemplified as the method for providing the first support layer 25.

(raw material polarizer)
It is preferable that the raw material polarizer 20 is resistant to significant deterioration by active energy rays applied to cure the curable resin (X) in the curable resin composition filled in the through holes 22. Such a raw material polarizer 20 is, for example, a film in which a dichroic dye is adsorbed and oriented on a polyvinyl alcohol resin film, or a film in which a dichroic dye is oriented in a cured layer of a polymerizable liquid crystal compound. , these manufacturing methods are as explained in the above-mentioned polarizing region 11.

(Raw material retardation layer)
The raw material retardation layer is entirely composed of a retardation region having retardation characteristics. The raw material retardation layer can have, for example, the retardation characteristics that the retardation region 75 described above has. The raw material retardation layer can have retardation characteristics that function as, for example, a quarter-wave plate, a half-wave plate, a quarter-wave plate with reverse wavelength dispersion, or a positive C plate.

The raw material retardation layer is, for example, a stretched film obtained by uniaxially or biaxially stretching a thermoplastic resin, or a polymerized and cured layer of a polymerizable liquid crystal compound.

The thermoplastic resin constituting the stretched film is preferably a translucent (preferably optically transparent) thermoplastic resin. Specifically, polyolefin resins such as chain polyolefin resins (polyethylene resins, polypropylene resins, etc.), cyclic polyolefin resins (norbornene resins, etc.); triacetyl cellulose, diacetyl cellulose, cellulose acetate propionate, Cellulose ester resins such as cellulose acetate butyrate; polyethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate, polybutylene naphthalate, polytrimethylene terephthalate, polytrimethylene naphthalate, polycyclohexane dimethyl terephthalate, polycyclohexane dimethyl naphthalate, etc. Polyester resins; polycarbonate resins; (meth)acrylic resins; polystyrene resins; or mixtures and copolymers thereof.

The polymerizable liquid crystal compound constituting the polymerized cured layer is a compound that has a polymerizable reactive group and exhibits liquid crystallinity. Examples of the polymerizable reactive group include the polymerizable reactive groups exemplified in the raw material polarizer. The type of polymerizable liquid crystal compound is not particularly limited, and rod-like liquid crystal compounds, discotic liquid crystal compounds, and mixtures thereof can be used. 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 raw material retardation layer can be prepared by [v] For example, a method of applying a retardation layer forming composition containing a polymerizable liquid crystal compound onto an alignment layer formed on a base film, and polymerizing and curing the polymerizable liquid crystal compound. , [vi] The composition for forming a retardation layer may be applied onto the base layer to form a coating film, and the coating film may be stretched together with the base layer. Examples of the base material layer include the base film used in the above [ii] described in connection with the raw material polarizer.

Examples of the stretched film and polymerized cured layer that constitute the raw material retardation layer include the retardation layer described in International Publication No. 2018/003416.

(Structure for forming reinforcement material (structure))
The structure 58 is a structure that includes only the cell region 55 and does not have the non-cell region 56. As described above, the structure 58 can be obtained by forming the cell partition walls 53 that partition the first cells 51 using a resin material or an inorganic oxide. Materials that can be used as resin materials and inorganic oxides, and methods for forming cell partition walls 53 using these materials include the materials and methods exemplified above.

<Optical laminate>
10 and 11 are schematic cross-sectional views schematically showing an example of the optical laminate of this embodiment. The optical laminate has a protective layer on one side or both sides of polarizer composites 40 and 41 shown in FIGS. 1 and 4.

(Optical laminate (1))
FIG. 10 is a schematic cross-sectional view schematically showing an example of the optical laminate of this embodiment. The optical laminate 45 shown in FIG. 10 has protective layers 17 and 18 on both sides of the polarizer composite 40 shown in FIG. 1(a). The optical laminate 45 may have the protective layer 17 (or 18) only on one side of the polarizer composite 40. The polarizer composite 40 included in the optical laminate 45 may be the polarizer composite 40 shown in FIG. 2(a) or (b). The protective layers 17 and 18 can be provided on the polarizer composite 40 via a bonding layer such as an adhesive layer or an adhesive layer. In this case, for example, a film-like protective layer may be laminated on the polarizer composite 40 via a bonding layer. The protective layers 17 and 18 may be provided in direct contact with the polarizer composite 40 without interposing a bonding layer. In this case, for example, the protective layers 17 and 18 are formed by applying a composition containing the resin material constituting the protective layers 17 and 18 onto the polarizer composite 40 and solidifying or curing the applied layer. be able to.

When the optical laminate 45 is one in which the protective layers 17 and 18 are provided on the first reinforcing material 50 side and the second reinforcing material 60 side of the polarizer composite 40 via a bonding layer, the first reinforcing material so as to fill the internal space of the first cell 51 of 50 and the gap between the plurality of first cells 51, the internal space of the second cell 61 of the second reinforcing material 60, the gap between the plurality of second cells 61, etc. It is preferable to form the protective layers 17 and 18 by providing a bonding layer. When the optical laminate 45 has the protective layers 17 and 18 provided in direct contact with the first reinforcing material 50 side and the second reinforcing material 60 side of the polarizer composite 40, the first reinforcing material 50 Protection is performed so as to fill the internal space of the first cell 51 and the gaps between the plurality of first cells 51, the internal space of the second cell 61 of the second reinforcing material 60, the gaps between the plurality of second cells 61, etc. It is preferable to form the protective layers 17 and 18 by providing a composition containing a resin material constituting the layers 17 and 18.

(Optical laminate (2))
FIG. 11 is a schematic cross-sectional view schematically showing an example of the optical laminate of this embodiment. The optical laminate 46 shown in FIG. 11 has protective layers 17 and 18 on both sides of the polarizer composite 41 shown in FIG. The optical laminate 46 may have the protective layer 17 (or 18) only on one side of the polarizer composite 41. The protective layers 17 and 18 can be provided on the polarizer composite 41 via a bonding layer such as an adhesive layer or an adhesive layer. In this case, for example, a film-like protective layer may be laminated on the polarizer composite 41 via a bonding layer. The protective layers 17 and 18 may be provided in direct contact with the polarizer composite 41 without interposing the bonding layer. In this case, for example, the protective layers 17 and 18 are formed by applying a composition containing the resin material constituting the protective layers 17 and 18 onto the polarizer composite 41 and solidifying or curing the applied layer. be able to.

When the optical laminate 45 is one in which the protective layer 18 is provided on the second reinforcing material 60 side of the polarizer composite 41 via a bonding layer, the internal space of the second cell 61 of the second reinforcing material 60 It is preferable to form the protective layer 18 by providing a bonding layer so as to fill the gaps between the plurality of second cells 61 and the like. When the optical laminate 45 is provided with the protective layer 18 in direct contact with the second reinforcing material 60 side of the polarizer composite 41, the inner space of the second cell 61 of the second reinforcing material 60 and the plurality of It is preferable to form the protective layer 18 by providing a composition containing a resin material constituting the protective layer 18 so as to fill the gaps between the second cells 61 and the like.

The protective layers 17 and 18 in the optical laminates 45 and 46 are made of active energy ray-curable resin compositions (curable resin) provided directly on the first reinforcing material 50, retardation layer 71, and second reinforcing material 60, respectively (X)) may be a cured product layer. The curable resin (X) constituting the protective layers 17 and 18, which are cured material layers, is not particularly limited as long as it is a resin that is cured by irradiation with active energy rays such as ultraviolet rays, visible light, electron beams, and X-rays. , for example, the curable resin (X) described above. The cured product of the curable resin (X) constituting the protective layers 17 and 18 can be the same as the cured product included in the non-polarizing region 12 of the polarizer 10.

In order to manufacture the optical laminates 45 and 46, for example, the first reinforcing material 50, the retardation layer 71, and the second reinforcing material 60 side of the polarizer composites 40 and 41 contain a curable resin (X). The curable resin (X) contained in the curable resin composition is cured by coating the curable resin composition and irradiating it with active energy rays. As a result, the protective layers 17 and 18, which are cured layers of the curable resin (X) contained in the curable resin composition, are formed on the first reinforcing material 50, the retardation layer 71, and the second reinforcing material 60, respectively. The optical laminates 45 and 46 may be obtained by forming the optical laminates 45 and 46.

In the optical laminates 45 and 46, one of the protective layers 17 and 18 may be provided with a bonding layer interposed therebetween, and the other may be a protective layer provided without a bonding layer interposed therebetween. The protective layers 17 and 18 included in the optical laminates 45 and 46 may be the same or different from each other.

When coating with a curable resin composition, a base film may be provided to cover the surface of the coating layer formed by coating. In this case, the base film is used as the protective layers 17 and 18, and the cured product layer of the curable resin (X) is also used as a bonding layer for bonding the protective layers 17 and 18 to the polarizer composites 40 and 41. good. The base film may be peeled off after the curable resin (X) is cured.

(protective layer)
The protective layers 17 and 18 are preferably resin layers that can transmit light, and may be resin films or coating layers formed by applying a composition containing a resin material. The resin used in the resin layer is preferably a thermoplastic resin that has excellent transparency, mechanical strength, thermal stability, moisture barrier properties, isotropy, stretchability, and the like. Examples of the thermoplastic resin include thermoplastic resins that constitute the base film that may be used for manufacturing the raw material polarizer 20 described above. When the optical laminates 45 and 46 have protective layers 17 and 18 on both sides, the resin compositions of the protective layers 17 and 18 may be the same or different.

The thickness of the protective layers 17 and 18 is usually 200 μm or less, preferably 150 μm or less, more preferably 100 μm or less, may be 80 μm or less, and may be 60 μm or less, from the viewpoint of thinning. It's okay. The thickness of the protective layers 17 and 18 is usually 5 μm or more, may be 10 μm or more, or may be 20 μm or more. The protective layers 17 and 18 may or may not have a phase difference. When the optical laminates 45 and 46 have protective layers 17 and 18 on both sides, the thicknesses of the protective layers 17 and 18 may be the same or different.

(Lamination layer)
The bonding layer is a pressure-sensitive adhesive layer or an adhesive layer. Examples of the adhesive for forming the adhesive layer and the adhesive for forming the adhesive layer include the adhesives and adhesives used for forming the above-described filler.

<Laminated body having a lamination layer for optical display element>
The polarizer composites 40 and 41 shown in FIGS. 1 and 4 and the optical laminates 45 and 46 shown in FIGS. 10 and 11 are further used as optical display elements (liquid crystal It may have a bonding layer for an optical display element for bonding to a panel, an organic EL device).

In the polarizer composites 40, 41 and the optical laminates 45, 46, when providing an optical display element bonding layer on the surface of the first reinforcing material 50 or the surface of the second reinforcing material 60, the first reinforcing material 50 and The material constituting the bonding layer for an optical display element is used as the filler provided in the second reinforcing material 60, and the inner space etc. of the first cell 51 of the first reinforcing material 50 and the second cell 61 of the second reinforcing material 60 are The filling of the filler into the internal space and the formation of the optical display element bonding layer may be performed simultaneously.

10 polarizer, 11 polarizing region, 11m first plane, 11n second plane, 12 non-polarizing region, 17, 18 protective layer, 20 raw material polarizer, 21 perforated polarizer, 22 through hole, 25 first support layer, 26 second support layer, 27 third support layer, 31 first laminate, 32 through hole, 33 second laminate, 34 through hole, 40, 41 polarizer composite, 45, 46 optical laminate, 50 first reinforcing material, 51 first cell, 52 through hole, 53 cell partition, 60 second reinforcing material, 61 second cell, 63 cell partition, 70, 71 retardation layer, 72 through hole, 75 retardation region, 76 non-position Retardation region, 80 Polymerization cured layer with base material layer, 81 Perforated retardation layer, 84 Base material layer, 85 Polymerization cured layer.

Claims (14)

An optical laminate having a protective layer on one side or both sides of a polarizer composite,
The polarizer composite includes a polarizer, a retardation layer and a first reinforcing material provided on one surface of the polarizer, and a second reinforcing material provided on the other surface of the polarizer. , has
The polarizer has a polarizing region having a thickness of 15 μm or less, and a non-polarizing region surrounded by the polarizing region in plan view,
The retardation layer has a retardation region that has a retardation property and exists in a region corresponding to the polarization region, and a non-retardation region that does not have a retardation property and exists in a region corresponding to the non-polarization region. having a region,
The first reinforcing material is
a plurality of first cells each having an open end surface, each of which is arranged such that each open end surface faces the surface of the polarizer;
A cell region where the first cell exists and which exists in a region corresponding to the polarizing region, and a non-cell region which exists in a region where the first cell does not exist and corresponds to the non-polarizing region. ,
The second reinforcing material is
a plurality of second cells each having an open end surface, each of which is arranged such that each open end surface faces the surface of the polarizer;
the second cell is present in an area corresponding to at least the non-polarizing area,
The non-polarizing region, the non-retardation region, and the non-cell region include a cured product of an active energy ray-curable resin,
The cured material included in the non-polarizing region is provided in a through hole surrounded by the polarizing region in a plan view,
The cured material included in the non-retardation region is provided in a through hole surrounded by the retardation region in plan view,
The protective layer is a resin film having a thickness of 20 μm or more, and covers the entire surface of one side of the polarizer composite on the one side of the polarizer of the polarizer composite , and has an adhesive layer. An optical laminate that is laminated on the polarizer composite through only an agent layer or an adhesive layer. The optical laminate according to claim 1, wherein the retardation layer and the first reinforcing material are provided in this order from the polarizer side. The optical laminate according to claim 1, wherein the first reinforcing material and the retardation layer are provided in this order from the polarizer side. The thickness of the cured product is the same as the thickness of a laminated structure portion including the polarization region, the retardation region, and the cell region in the polarizer composite, according to any one of claims 1 to 3. optical laminate. The thickness of the cured product is smaller than the thickness of a laminated structure portion including the polarizing region, the retardation region, and the cell region in the polarizer composite. Optical laminate. The thickness of the cured product is larger than the thickness of a laminated structure portion including the polarizing region, the retardation region, and the cell region in the polarizer composite. Optical laminate. The optical laminate according to claim 1, wherein the retardation region is a polymerized and cured layer of a polymerizable liquid crystal compound. The optical laminate according to any one of claims 1 to 7, wherein the non-polarizing region has translucency. The optical laminate according to any one of claims 1 to 8, wherein the non-polarizing region has a diameter in a plan view of 0.5 mm or more and 20 mm or less. The optical laminate according to any one of claims 1 to 9, wherein the active energy ray-curable resin contains an epoxy compound. The optical laminate according to claim 10, wherein the epoxy compound includes an alicyclic epoxy compound. The optical laminate according to any one of claims 1 to 11, wherein the openings of the first cell and the second cell each independently have a polygonal shape, a circular shape, or an elliptical shape. The optical laminate according to any one of claims 1 to 12, further comprising a translucent filler provided in the interior space of the first cell. The optical laminate according to any one of claims 1 to 13, further comprising a translucent filler provided in the inner space of the second cell.

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