JP7456748B2 - optical laminate - Google Patents

Description

The present invention relates to a polarizer with a retardation layer, 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.

The present invention provides a polarizer with a retardation layer, a polarizer composite, and an optical laminate including a novel polarizer, which replaces a polarizer in which a region with a low content of a dichroic substance is formed by chemical treatment such as decolorization. The purpose is to provide.

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

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

(a) is a schematic plan view of the polarizer side schematically showing an example of the polarizer with a retardation layer of the present invention, and (b) is a z- It is a z' cross-sectional view. (a) to (e) are schematic cross-sectional views schematically showing other examples of the polarizer with a retardation layer of the present invention. (a) and (b) are diagrams schematically showing an example of a non-polarizing region and a cross-section around the non-retardation region of a polarizer with a retardation layer, in which a polarizer provided in the non-polarization region and a non-retardation region; FIG. 3 is an explanatory diagram for explaining a method for determining the thickness of a cured product. (a) to (d) are schematic cross-sectional views schematically showing an example of a method for manufacturing a polarizer with a retardation layer according to the present invention. (a) and (b) are schematic cross-sectional views schematically showing a continuation of the method for manufacturing the polarizer with a retardation layer shown in FIG. 4. 5A to 5D are schematic cross-sectional views illustrating another example of the method for producing a polarizer with a retardation layer of the present invention. (a) to (d) are schematic cross-sectional views schematically showing a continuation of the method for manufacturing the polarizer with a retardation layer shown in FIG. 6. (a) is a schematic cross-sectional view schematically showing an example of a polarizer composite of the present invention, and (b) is a schematic plan view of the polarizer composite on the reinforcing material side. FIG. 3 is a schematic cross-sectional view schematically showing another example of the polarizer composite of the present invention. 1A and 1B are schematic cross-sectional views illustrating an example of the optical layered body of the present invention. (a) and (b) are schematic cross-sectional views schematically showing another example of the optical laminate of the present invention. (a) and (b) are schematic cross-sectional views schematically showing still another example of the optical laminate of the present invention.

Hereinafter, preferred embodiments of a polarizer with a retardation layer, a polarizer composite, and an 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 with retardation layer>
(Polarizer with retardation layer (1))
FIG. 1(a) is a schematic plan view of the polarizer side schematically showing an example of the polarizer with a retardation layer of this embodiment, and FIG. 1(b) is a plan view of the retardation layer shown in FIG. FIG. 2 is a cross-sectional view taken along line zz' of a layered polarizer. A polarizer 40 with a retardation layer shown in FIGS. 1A and 1B includes a polarizer 10 and a retardation layer 70 provided on one surface of the polarizer 10.

The polarizer 10 included in the polarizer 40 with a retardation layer 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. In the non-polarizing region 12, a cured product of active energy ray-curable resin (hereinafter sometimes referred to as "curable resin (X)") is provided in a through hole 22 surrounded by the polarizing region 11 in plan view. This is an area where

The thickness of the polarizing region 11 is 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 more. If the thickness of the polarizing region 11 exceeds the above range, the workability for providing the active energy ray-curable resin composition containing the curable resin (X) described below in the non-polarizing region 12 is likely to decrease. Furthermore, if the polarization region 11 is less than the above range, it becomes difficult to obtain desired optical characteristics. The thickness of the polarizing region 11 can be measured using, for example, a contact type film thickness measuring device (MS-5C, manufactured by Nikon Corporation).

The arrangement of the polarized regions 11 and non-polarized regions 12 in the polarizer 10 is not particularly limited as long as the polarized regions 11 are arranged to surround the non-polarized regions 12. In a plan view of the polarizer 10, it is preferable that the total area occupied by the polarized regions 11 is larger than the total area occupied by the non-polarized regions 12. The polarizer 10 may have one non-polarized region 12, or may have two or more non-polarized regions 12. When the polarizer 10 has two or more non-polarized regions 12, the shapes of the non-polarized regions 12 may be the same as each other or may be different from each other.

The retardation layer 70 is entirely composed of a retardation region having retardation characteristics. The retardation region 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 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 using light with 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 (i.e., 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 measurement device (trade name: KOBRA-WPR) manufactured by Oji Scientific Instruments.

The retardation characteristic that the retardation layer 70 has is not particularly limited. The retardation layer 70 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 thickness of the retardation layer 70 is not particularly limited, but is 30 μm or less, may be 20 μm or less, may be 15 μm or less, may be 13 μm or less, may be 10 μm or less, and may be 8 μm or less. It may be 5 μm or less, and usually 1 μm or more.

For forming the retardation layer 70, a raw material retardation layer described below can be used. The retardation layer 70 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 retardation layer 70 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. The retardation layer-equipped polarizer 40 may have one retardation layer on one side of the polarizer 10, or may have two or more retardation layers. 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.

The polarizer 40 with a retardation layer has a non-polarizing region 12 surrounded by a polarizing region 11 in plan view, as shown in FIG. 1(a). Therefore, when applying the polarizer 40 with a retardation layer to a display device such as a liquid crystal display device or an organic EL display device used in smartphones, tablet terminals, etc., it is necessary to match the polarizer 40 to a camera lens, By arranging a printed portion such as an icon or a logo, it is possible to suppress a decrease in camera sensitivity and a decrease in design.

In the polarizer 40 with a retardation layer, the non-polarization region 12 contains a cured product of the curable resin (X), so that the through-hole 22 of the polarizer 10 can be made solid. The polarizer 10 of the polarizer 40 with a retardation layer is thin, having a thickness of 15 μm or less. If the non-polarization region 12 does not have a cured product of the curable resin (X) and the through-hole 22 is hollow, there is a risk of problems such as cracks occurring around the through-hole 22 due to shrinkage of the polarizer caused by temperature changes when applied to a display device. In contrast, as in the polarizer 10 of the polarizer 40 with a retardation layer, the non-polarization region 12 can be made solid by providing a cured product of the curable resin (X) in the through-hole 22, so that the occurrence of the above problems can be suppressed.

(Polarizer with retardation layer (2))
FIGS. 2(a) to 2(e) are schematic cross-sectional views schematically showing other examples of the polarizer with a retardation layer of this embodiment. A polarizer with a retardation layer 41 shown in FIGS. 2(a) to 2(e) includes a polarizer 10 and a retardation layer 71 provided on one surface of the polarizer 10. The polarizer 10 is as described above.

2(a) to (e), the retardation layer 71 has a retardation region 75 having retardation characteristics and a non-retardation region 76 having no retardation characteristics. The retardation region 75 is a region in which at least one of the in-plane retardation value (R0) and the thickness direction retardation value (Rth) is greater than 40 nm at a wavelength of 590 nm, as described for the retardation layer 70 shown in FIG. 1. The non-retardation region 76 is 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 calculation and measurement of the in-plane retardation value (R0) and the thickness direction retardation value (Rth) can be performed by the method described above.

In the retardation layer 71 included in the polarizer 41 with a retardation layer, the retardation region 75 exists in a region corresponding to the polarization region 11 of the polarizer 10 , and the non-retardation region 76 exists in a region corresponding to the non-polarization region 12 of the polarizer 10 Exists in the area corresponding to . 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 with a retardation layer described below, a polarizer with a retardation layer in which the retardation region 75 is present in the region corresponding to the polarization region 11 can be efficiently manufactured. When the polarizer 10 included in the polarizer 41 with a retardation layer has two or more non-polarizing regions 12, it is sufficient that the non-retardation region 76 exists in a region corresponding to at least one non-polarizing region 12. , a retardation region 75 may be present in a region corresponding to another non-polarizing region 12.

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. The retardation layer-equipped polarizer 41 may have one retardation layer on one side of the polarizer 10, or may have two or more retardation layers. 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 there are two or more retardation layers, as long as at least one layer is the retardation layer 71, the other retardation layer may be, for example, the above-mentioned retardation layer 70. In this case, the retardation layer 71 is preferably provided on a side relatively close to the polarizer 10.

The non-polarizing region 12 and the non-retardation region 76 of the polarizer 41 with a retardation layer contain a cured product of curable resin (X). 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 through holes 22 of the polarizer 10 and the through holes 72 of the retardation layer 71 can have the same shape in plan view. The through hole 22 and the through hole 72 may communicate with each other 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 and 72. can.

Similar to the polarizer 40 with a retardation layer shown in FIG. 1, the polarizer 41 with a retardation layer can also suppress a decrease in camera sensitivity and a decrease in design when applied to a display device. The occurrence of the above-mentioned problems can be suppressed. In particular, in the polarizer 41 with a retardation layer, 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.

The thickness of the cured resin (X) provided in the polarizer 41 with a retardation layer is the same as the thickness of the layered structure portion including the polarization region 11 and the retardation region 75 in the polarizer 41 with a retardation layer. (FIG. 2(a)), may be smaller than the thickness of the laminated structure portion (FIGS. 2(b) and (c)), or may be larger than the thickness of the laminated structure portion (FIG. 2(a)). (d), (e)). The thickness of the laminated structure portion may be the total thickness of the polarizing region 11 and the retardation region 75, and this total thickness includes a layer interposed between the polarizing region 11 and the retardation region 75. The thickness may be included. For example, when the polarizer 41 with a retardation layer 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 retardation region 75. The thickness of the bonding 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 41 with a retardation layer fills at least a portion of the through hole 22 of the polarizer 10 and at least a portion of the through hole 72 of the retardation layer 71. It suffices if it is set up like this. When the polarizer 41 with a retardation layer has a bonding layer between the polarizer 10 and the retardation layer 71, a curable resin (X ) may be 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 above. More preferably, it is provided so as to fill the entire through hole of the bonding layer.

The thickness of the laminated structure portion including the polarizing region 11 and the retardation region 75 in the polarizer 41 with a retardation layer is preferably 30 μm or less, more preferably 25 μm or less, and even more preferably 20 μm or less. , 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 the cured product of the curable resin (X) in the non-polarizing region 12 and the non-retardation region 76 tends to decrease as described later. The thickness can be measured using, for example, a contact type film thickness measuring device (MS-5C, manufactured by Nikon Corporation).

The thickness of the cured material provided on the polarizer 41 with a retardation layer is determined as follows. First, in the polarizer 41 with a retardation layer, 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 a surface of the retardation region 75 of the retardation layer 71 A second plane including the surface (the surface on the opposite side to the polarizer 10 side) is assumed. Next, in the non-polarizing region 12, the first position is the position where the shortest distance between the surface of the cured product on the polarizer 10 side and the first plane is maximum, and the surface of the cured product on the retardation layer 71 side. A second position where the shortest distance between the first plane and the second plane is the maximum is determined. Then, the sum 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 using the retardation layer. This is the thickness of the cured material provided on the polarizer 41.

A method for determining the thickness when the thickness of the cured material provided in the non-polarized region 12 and the non-retardation region 76 differs from the thickness of the laminated structure portion including the polarized region 11 and the retardation region 75 in the retardation layer-attached polarizer 41 will be specifically described with reference to FIG. 3. FIGS. 3(a) and (b) are diagrams that show an example of a cross section around the non-polarized region and the non-retardation region of a retardation layer-attached polarizer, and are explanatory diagrams for explaining a method for determining the thickness of the cured material provided in the non-polarized region and the non-retardation region.

When the cured material is provided in the non-polarizing region 12 and the non-retardation region 76 as shown in FIG. It is assumed that a straight line in the region 12 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-retardation region 76 along the surface side of the retardation layer 71 opposite to the polarizer 10 side is defined as the second plane 11n. Assume. The length of the straight line (Fig. The position where "dn" in 3(a) is maximum is defined as the second position. Here, as shown in FIG. 3A, the surface of the cured material provided in the non-polarizing region 12 and the non-retardation region 76 is in the first plane 11 m in the thickness direction of the polarizer 41 with a retardation layer. And when it exists on the inner side (on the polarizer 10 and retardation layer 71 side) of the second 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 region 12 and the non-retardation region 76 shown in FIG. 3(a) can be determined as D+dm+dn (dm and dn are negative values).

In addition, in the case where the cured material is provided in the non-polarized region 12 and the non-retardation region 76 as shown in FIG. 3(b), the thickness of the cured material provided in the non-polarized region 12 and the non-retardation region 76 can be determined by assuming the first plane 11m and the second plane 11n in the same manner as described above. Specifically, first, among the straight lines that connect an arbitrary point on the first plane 11m and an arbitrary point on the surface of the cured material provided in the non-polarized region 12 to form the shortest distance, the position at which the length of the straight line ("dm" in FIG. 3(b)) is maximum is taken as the first position. Next, among the straight lines that connect an arbitrary point on the second plane 11n and an arbitrary point on the surface of the cured material provided in the non-retardation region 76 to form the shortest distance, the position at which the length of the straight line ("dn" in FIG. 3(b)) is maximum is taken as the second position. Here, as shown in FIG. 3(b), when the surface of the cured material provided in the non-polarizing region 12 and the non-retardation region 76 is present on the outer side (opposite the polarizer 10 and the retardation layer 71 side) of the first plane 11m and the second plane 11n in the thickness direction of the retardation layer-attached polarizer 41, dm and dn are shown as positive values. In this case, the thickness of the cured material provided in the non-polarizing region 12 and the non-retardation region 76 shown in FIG. 3(b) can be determined as D+dm+dn (dm and dn are positive values).

The polarizers 40 and 41 with retardation layers may be circularly polarizing plates. In this case, the retardation regions 75 of the retardation layers 70 and 71 can have retardation characteristics that function as quarter-wave plates. When the polarizers 40 and 41 with retardation layers are circularly polarizing plates, two or more retardation layers 70 and 71 may be provided on one surface of the polarizer 10. For example, on one side of the polarizer 10, retardation characteristics are [a] a 1/2 wavelength plate and a 1/4 wavelength plate, [b] a 1/4 wavelength plate with reverse wavelength dispersion, and a positive C plate. The retardation layers 70 and 71 may be stacked so that they are arranged in this order, or [c] the positive C plate and the reverse wavelength dispersion quarter-wave plate.

The retardation layer-equipped polarizer 40 may be a sheet body, or may be an elongated body having a length that is wound into a roll shape during storage or transportation. The planar shape and size of the polarizer 40 with a retardation layer 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, we will briefly explain the manufacturing method of the preferred polarizing region 11, which is obtained by dyeing a polyvinyl alcohol film with iodine and uniaxially stretching it.

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, which will be 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. 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.

Since the non-polarizing region 12 of the polarizer 10 has light-transmitting properties, optical transparency can be ensured in the non-polarizing region 12. As a result, when applying the polarizers 40 and 41 with retardation layers 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, the sensitivity of the camera can be improved. It is possible to suppress the deterioration and the deterioration of the design quality.

The planar shape of the non-polarizing region 12 is not particularly limited, but may be a circle; an ellipse; an oval; a polygon such as a triangle or a rectangle; a rounded polygon with at least one corner of the polygon being rounded (a shape having an R), 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, may be smaller than the thickness of the polarizing region 11, or may be larger than the thickness of the polarizing region 11. As described above, it is preferable that the cured product of the curable resin (X) provided in the non-polarizing region 12 is 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 41 with a retardation layer 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.

(Retardation Region)
The retardation layer 71 has retardation characteristics, 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 be independently 100 nm or more, 500 nm or more, or 1000 nm or more, and is 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 an area formed by a raw retardation layer, the entirety of which is a retardation region, as described later. When a laminate of multiple retardation layers having different retardation properties is used as the retardation region 75, the laminate of multiple layers can be used as the raw retardation layer. Therefore, the retardation region 75 is formed by a material that constitutes the raw retardation layer, as described later, and specifically can contain a thermoplastic resin. The retardation region can be formed, for example, by 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 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 more.

(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 polarizers 40 and 41 with retardation layers to a display device, the non-polarizing region 12 and By arranging a printed portion such as a camera lens, an icon, or a logo in correspondence with the non-retardation area 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 41 with a retardation layer described above. Specifically, in the above measurement method, the first plane is the surface of the retardation region 75 of the retardation layer 71 that is opposite to the surface included in the second plane, and the curable resin ( What is necessary is to determine the thickness of the cured product of X).

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 composition (curable resin composition))
As described above, the non-polarized region 12 in the polarizer 40 with a retardation layer, and the non-polarized region 12 and the non-retardation region 76 in the polarizer 41 with a retardation layer are made of active energy ray-curable resin (curable resin (X )) is provided with a cured product, preferably by an active energy ray-curable resin composition (hereinafter sometimes referred to as "curable resin composition") containing the curable resin (X). It is formed. 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.

The curable resin composition is preferably a solvent-free type. The term "solvent-free type" means that no solvent is actively added. Specifically, a solvent-free curable resin composition means that the content of the solvent is 5% by weight or less relative to 100% by weight of the curable resin (X) contained in the curable resin composition.

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 its 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 of the epoxy compound is usually within the range of 40 to 3000 g/equivalent, preferably 50 to 1500 g/equivalent. If 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 and the retardation region 75 of the retardation layer 71 and the cured product of the curable resin (X) forming the non-polarizing region 12 and the non-retardation region 76, so it is preferably used. . 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. A curable resin (X) that forms the polarizing region 11 of the polarizer 10 and the retardation region 75 of the retardation layer 71, as well as the non-polarizing region 12 and the non-retardation region 76, by using a (meth)acrylic compound together. It can be expected to have the effect of increasing the adhesion with the cured product of curable resin (X), the hardness and mechanical strength of the cured product of curable resin (X), and furthermore, it can be used to adjust the viscosity, curing speed, etc. It will be easier to do. "(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.

(Method for manufacturing polarizer (1) with retardation layer)
4 and 5 are schematic cross-sectional views schematically showing an example of a method for manufacturing a polarizer with a retardation layer according to the present embodiment. 4 and 5 show the case where the polarizer 40 with a retardation layer shown in FIG. 1 is obtained. The polarizer 40 with a retardation layer can be manufactured using, for example, a raw material polarizer 20 that has the same visibility correction polarization degree (Py) as a whole and does not have the non-polarizing region 12. 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.

The polarizer 40 with a retardation layer can be manufactured, for example, in the following process. First, as shown in FIG. 4A, a first laminate 31 is prepared in which 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. A through hole 32 penetrating in the stacking direction is formed in the prepared first laminate 31 by punching, cutting, cutting, laser cutting, or the like (FIG. 4(b)). As a result, a perforated polarizer 21 in which through holes 22 are formed in the raw material polarizer 20 is obtained. Subsequently, after the second support layer 26 is removably provided on the perforated polarizer 21 side of the first laminate 31 in which the through holes 32 are formed (FIG. 4(c)), the first support layer 25 is peeled off. (Figure 4(d)). As a result, a second laminate 33 in which the second support layer 26 and the perforated polarizer 21 are stacked is obtained (FIG. 4(d)). The second support layer 26 is provided so as to close one side of the through hole 22 of the perforated polarizer 21 .

Next, the through holes 22 of the perforated polarizer 21 of the second laminate 33 are filled with a curable resin composition containing the curable resin (X), and activated energy rays are irradiated to fill the through holes 22 with the curable resin composition. Curing the curable resin (X). As a result, a cured product of the curable resin (X) is formed in the through holes 22 of the perforated polarizer 21, and a third laminate 34 in which the polarizer 10 is laminated on the second support layer 26 is obtained (FIG. 5 (a)). In the polarizer 10 of the third laminate 34, the region other than the through holes 22 of the perforated polarizer 21 becomes the polarizing region 11, and the region of the through hole 22 provided with the cured material becomes the non-polarizing region 12. Then, the retardation layer 70 is laminated on the polarizer 10 side of the third laminate 34 via a bonding layer (not shown) to form the retardation layer-attached polarizer 40. After laminating the retardation layer 70, the second support layer 26 may be peeled off.

The method for filling the through holes 22 of the perforated polarizer 21 with the curable resin composition is not particularly limited. For example, the curable resin composition may be injected into the through holes 22 of the perforated polarizer 21 of the second laminate 33 using a dispenser or a dispenser. The through holes 22 of the perforated polarizer 21 may be filled with the curable resin composition while coating the surface of the polarizer 21 with the curable resin composition. The cured product layer of the curable resin composition coated on the surface of the perforated polarizer 21 can be used as a protective layer to be described later. When coating with a curable resin composition, a base film may be provided to cover the surface of the coating layer formed by coating. The base film may be used as a protective layer to be described later, and in this case, the cured product layer of curable resin (X) may be a lamination layer for laminating the protective layer to be described later. The base film may be peeled off after the curable resin (X) contained in the curable resin composition is cured.

The first support layer 25 may be a support layer used in manufacturing the raw polarizer 20, or may be the above-mentioned base film used in coating the curable resin composition. Alternatively, it may be a peelable support layer attached to the raw polarizer 20 with a volatile liquid such as water, or may be an adhesive sheet peelable from the raw polarizer 20. The second support layer 26 may be a peelable support layer attached to the holey polarizer 21 with a volatile liquid such as water, or may be an adhesive sheet peelable from the holey polarizer 21.

By providing the retardation layer 70 on the polarizer 10 provided with the non-polarizing region 12, a polarizer 40 with a retardation layer shown in FIG. 1(b) can be manufactured. This retardation layer 70 may be a stretched film obtained by uniaxially or biaxially stretched thermoplastic resin, or may be a polymerized and cured layer of a polymerizable liquid crystal compound. When the retardation layer 70 is a polymerized and cured layer, a polymerized and cured layer with a base material layer may be used, in which a polymerizable liquid crystal compound is polymerized and cured on the base layer to form a polymerized and cured layer. After laminating the polymerized cured layer side of this polymerized cured layer with a base material layer on the polarizer 10 side of the third laminate 34 via the bonding layer, by peeling off the base material layer, The retardation layer 70 can be formed.

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. This allows the filling of the curable resin composition into the through holes 22 of the perforated polarizer 21 and the curing process of the curable resin (X) contained in the curable resin composition filled into the through holes 22 to be performed in a short time. Since the process can be carried out with

(Method for manufacturing polarizer (2) with retardation layer)
6 and 7 are schematic cross-sectional views schematically showing an example of a method for manufacturing a polarizer with a retardation layer according to the present embodiment. 6 and 7 show the case where the polarizer 41 with a retardation layer shown in FIG. 2(a) is obtained, but the polarizer 41 with a retardation layer shown in FIGS. 2(c) and 2(e) is also It can be manufactured by the method described below. The polarizer 41 with a retardation layer uses, for example, a raw material polarizer 20 (FIG. 6(a)) that has the same visibility correction polarization degree (Py) as a whole and does not have a non-polarizing region 12, and further It can be manufactured using a polymerized hardened layer 85 (FIG. 6(b)) whose entirety is a retardation region as a raw material retardation layer. Since the raw material polarizer 20 becomes 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.

The polarizer 41 with a retardation layer can be manufactured, for example, in the following process. First, the first laminate 31 is prepared according to the procedure described in the method for manufacturing the polarizer 40 with a retardation layer (FIG. 6(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 6(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 side of the prepared first laminate 31 via a bonding layer (not shown) (FIG. 6(c)). Thereby, a fourth laminate 35 is obtained in which the base material layer 84, the polymerized cured layer 85, the raw material polarizer 20, and the first support layer 25 are laminated in this order (FIG. 6(c)). A through hole 36 (including through holes 22 and 72) penetrating in the stacking direction is formed in the fourth laminate 35 by punching, cutting, cutting, laser cutting, etc. (FIG. 6(d)), and the first The support layer 25 is peeled off to obtain a fifth laminate 37 (FIG. 7(a)). As a result, a perforated polarizer 21 in which the through holes 22 are formed in the raw material polarizer 20 and a perforated retardation layer 81 in which the through holes 72 are formed in the polymerized and cured layer 85 are obtained.

Subsequently, the third support layer 27 is laminated on the perforated polarizer 21 side of the fifth laminate 37 (FIG. 7(b)), and the base material layer 84 is peeled off (FIG. 7(c)). The third support layer 27 is provided so as to close one side of the through hole 22 of the perforated polarizer 21 . Thereafter, the through holes 22 of the perforated polarizer 21 and the through holes 72 of the perforated retardation layer 81 are filled with a curable resin composition containing the curable resin (X), and active energy rays are irradiated to make the through holes 22 of the perforated polarizer 21 and the through holes 72 of the perforated retardation layer 81 penetrate. The curable resin (X) in the holes 22 and 72 is cured to form a cured product of the curable resin (X) in the through holes 22 of the perforated polarizer 21 and the through holes 72 of the perforated retardation layer 81. (Figure 7(d)). As a result, a polarizer 41 with a retardation layer is obtained on the third support layer 27. In the polarizer 41 with a retardation layer, the polarizer 10 and the retardation layer 71 are laminated in this order on the third support layer 27 . After forming the cured product, the third support layer 27 may be peeled off. In the obtained polarizer 10, the region other than the through holes 22 of the perforated polarizer 21 becomes the polarizing region 11, and the region of the through hole 22 provided with the cured material becomes the non-polarizing region 12. In the obtained retardation layer 71, 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. . The non-polarizing region 12 in the polarizer 10 and the non-retardation region 76 in the retardation layer 71 communicate with each other.

Instead of the method described above, the polarizer 41 with a retardation layer shown in FIG. 2(a) can also be manufactured, for example, as follows. In the following, a case is shown in which the polarizer 41 with a retardation layer shown in FIG. 2(a) is obtained, but the polarizer 41 with a retardation layer shown in FIGS. 2(b) and (d) will also be described below. It can be manufactured by a method. As shown in FIGS. 6(c) and 6(d), after forming a through hole 36 penetrating the fourth laminate 35 in the stacking direction by punching, cutting, cutting, laser cutting, etc., the base material layer 84 is peeled off. Subsequently, the fourth support layer is laminated on the side exposed by peeling off the base material layer 84 (the holed retardation layer 81 side), and the first support layer 25 is peeled off. The fourth support layer 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 and the through-holes 72 of the perforated retardation layer 81 are filled with a curable resin composition, and the curable resin composition is irradiated with active energy rays. The curable resin (X) contained in the resin composition is cured to form a cured product of the curable resin (X) in the through holes 22 of the perforated polarizer 21 and the through holes 72 of the perforated retardation layer 81. . Thereby, a polarizer 41 with a retardation layer is obtained on the fourth support layer. In the polarizer 41 with a retardation layer, the retardation layer 71 and the polarizer 10 are laminated in this order on a fourth support layer. After forming the cured product, the fourth support layer may be peeled off.

As a method for filling the through holes 22 of the perforated polarizer 21 and the through holes 72 of the perforated retardation layer 81 with the curable resin composition, the filling method explained in the manufacturing method of the polarizer with a coating layer (1) is used. Can be mentioned. When filling the through holes 22 and 72 with the curable resin composition while coating the surface of the perforated polarizer 21 with the curable resin composition, the cured resin composition coated on the surface of the perforated polarizer 21 The cured product layer of the synthetic resin composition can be used as a protective layer, which will be described later. When coating with a curable resin composition, a base film may be provided to cover the surface of the coating layer formed by coating. The base film may be used as a protective layer to be described later, and in this case, the cured product layer of curable resin (X) may be a lamination layer for laminating the protective layer to be described later. The base film may be peeled off after the curable resin (X) contained in the curable resin composition is cured.

Examples of the method for providing the third support layer 27 and the fourth support layer include the methods exemplified as the method for providing the first support layer 25 and the second support layer 26.

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 about the polarizer 41 with a retardation layer, it is preferable that the thickness of the layered structure portion including the polarization region 11 and the retardation region 75 in the polarizer 41 with a retardation layer is 30 μm or less. The thickness of the polymerized hardened layer 85 is preferably 15 μm or less. Therefore, the depth of the through hole 72 provided in the perforated retardation layer 81 can also be 15 μm or less. Thereby, the total depth of the through hole 22 and the through hole 72 can be 30 μm or less. Therefore, the through holes 22 of the perforated polarizer 21 and the through holes 72 of the perforated retardation layer 71 are filled with the curable resin (X), and the through holes 22 and the through holes 72 are filled with the curable resin (X). ) can be performed in a short time, so it is possible to suppress a decrease in workability.

Here, the production of the raw material polarizer and the raw material retardation layer used in the production of the polarizer with a retardation layer will be briefly described.

(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 layer 70 or the retardation region 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 retardation layer forming composition 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 for 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.

<Polarizer composite>
(Polarizer composite (1))
FIG. 8(a) is a schematic cross-sectional view schematically showing an example of the polarizer composite of this embodiment, and FIG. 8(b) is a schematic plan view of the reinforcing material side of the polarizer composite. The polarizer composite 42 shown in FIG. 8(a) includes the polarizer 40 with a retardation layer shown in FIG. and has. The reinforcing material 50 may be provided not only on the retardation layer 70 side of the retardation layer-equipped polarizer 40 but also on the polarizer 10 side.

In the polarizer composite 42, the reinforcing material 50 has a plurality of cells 51 arranged so that each open end face faces the surface of the polarizer 10. Each open end face may be directly in contact with and faces the polarizer 10, or may face the surface of the polarizer 10 via a retardation layer 70, as shown in the polarizer composite 42 shown in FIG. 8(a). The cells 51 have a hollow columnar (tubular) structure surrounded by cell partitions 53 that separate the cells 51, and both axial ends of the columnar structure are open end faces.

In the polarizer composite 42, the reinforcing material 50 is provided so that the cells 51 are present in a region corresponding (projected) to the non-polarizing region 12 of the polarizer 10 and its surroundings, as shown in FIG. 8(a). is preferable, and it is more preferable to provide the cells 51 so that they are present on the entire surface of the polarizer 40 with a retardation layer.

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 42, since the reinforcing material 50 is provided on one side of the polarizer 40 with a retardation layer as described above, cracks in the polarizer 10 that occur when subjected to temperature changes or shocks, and minute It is thought that this can prevent small cracks from progressing to large cracks. From the viewpoint of impact resistance of the polarizer composite 42, the reinforcing material 50 is preferably provided at least on the retardation layer 70 side of the polarizer 40 with a retardation layer.

The reinforcing material 50 is applied to display devices and the like together with the polarizer 10. If the internal space of the cell 51 of the reinforcing material 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 cell 51. Therefore, it is preferable that a translucent filler be provided in the internal space of the cells 51 of the reinforcing material 50 in the polarizer composite 42 . In the reinforcing material 50 of the polarizer composite 42, when a gap is provided between the plurality of cells 51 as described later, it is preferable that a translucent filler is provided also in this gap. Such fillers will be described later.

(Polarizer composite (2))
FIG. 9 is a schematic cross-sectional view schematically showing another example of the polarizer composite of this embodiment. The polarizer composite 43 shown in FIG. 9 includes the polarizer 41 with a retardation layer shown in FIG. . Here, a case is shown in which the reinforcing material 50 is provided on the retardation layer 71 side of the polarizer 41 with a retardation layer. In addition to the polarizer 10 side, it may also be provided on the polarizer 10 side. Further, the reinforcing material 50 may be provided on the polarizer 10 side without providing on the retardation layer 71 side, but from the viewpoint of impact resistance, the reinforcing material 50 is not provided on the retardation layer 71 side of the polarizer 40 with a retardation layer. Preferably, it is provided on the side.

The reinforcing material 50 is as described above. As described above, the reinforcing material 50 may be provided with a filler in the internal spaces of the cells 51 of the reinforcing material 50 and in the gaps between the plurality of cells 51.

The polarizer complex 43 shown in FIG. 9 includes the polarizer 41 with a retardation layer and the reinforcing material 50 shown in FIG. 2(a), but is not limited thereto. For example, the polarizer 41 with a retardation layer included in the polarizer complex 43 may be the polarizer 41 with a retardation layer shown in FIGS. 2(b) to (e).

(Reinforcement material)
As described above, the cells 51 of the reinforcing material 50 have a hollow columnar (cylindrical) structure surrounded by cell partition walls 53 that partition the cells 51, and the columnar structure has an open end face with both axial ends open. This is the result. The cell 51 has, as opening end faces, a first opening end face disposed on a side relatively close to the polarizer 10 of the polarizer composites 42 and 43, and a second opening disposed on a relatively far side. It has an end surface. The reinforcing material 50 only needs to be arranged so 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 openings of the cells 51 of the reinforcing material 50 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 cells included in the reinforcing material 50 may be the same or different from each other.

It is preferable that the plurality of cells 51 included in the reinforcing material 50 are arranged such that the openings of each cell 51 are adjacent to each other in a plan view of the opening end surface. The plurality of cells 51 are arranged so that the cells 51 are arranged without any gaps between each other, as in the case where the opening of the cell 51 has a hexagonal shape, for example, as shown in FIG. You may do so. Alternatively, in a plan view of the opening end surface of the plurality of cells 51, as in the case where the shape of the opening of the cell 51 is circular or the like, a part of the cell partition wall 53 of the plurality of cells 51 is in contact with each other, and the plurality of cells 51 may be arranged with a gap between them.

For example, as shown in FIG. 8(b), the reinforcing material 50 has a hexagonal opening in both the first opening end face and the second opening end face, and the opening has a hexagonal shape in the plane direction of the polarizer composite 42. It is preferable to have a honeycomb structure in which a plurality of cells are arranged adjacent to each other without gaps.

Although the size of the opening of the cell 51 of the reinforcing material 50 is not particularly limited, it is preferable that the opening has a smaller diameter than the diameter of the non-polarizing region 12. The diameter of the cell 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 this 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 cells 51 of the reinforcing material 50 (the length in the direction perpendicular to the opening end surface of the cells 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 cells 51 of the reinforcing material 50 have translucency.

The line width of the cell partition walls 53 of the reinforcing material 50 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 reinforcing material 50 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.

When reinforcing materials 50 are provided on both sides of the polarizers 40 and 41 with retardation layers, the two reinforcing materials 50 may be the same (the shape and size of the cells 51 are the same), or may be different from each other. You can leave it there. The openings of the cells 51 of the two reinforcing materials 50 provided on both sides of the polarizers 40 and 41 with retardation layers may be arranged so as to overlap each other in a plan view, but may be arranged so as to be shifted from each other in a plan view. It is preferable that the

(filling material)
The filler that may be provided in the reinforcing material 50 is not particularly limited as long as it has translucency and can fill the internal spaces of the cells 51 of the reinforcing material 50. The filler is preferably a different material from the material forming the cell partition walls 53 of the reinforcing material 50, and preferably includes 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)
The polarizer composites 42 and 43 shown in FIGS. 8 and 9 can be manufactured by forming a reinforcing material 50 on the polarizers 40 and 41 with retardation layers. The reinforcing material 50 can be obtained by forming cell partition walls 53 that partition the cells 51 on the surfaces of the polarizers 40 and 41 with retardation layers using a resin material or an inorganic oxide, for example.

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, additives, 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.

When the reinforcing material 50 of the polarizer composites 42 and 43 has a filler, the reinforcing material 50 formed in the polarizers 40 and 41 with retardation layers has a filling material in the internal spaces of the cells 51 and the gaps between the cells 51. What is necessary is just to fill it with the material which comprises a filler. The material constituting the filler may be filled, for example, by coating on the reinforcing material 50. Alternatively, when using an adhesive as the material constituting the filler, a pressure-sensitive adhesive sheet having a pressure-sensitive adhesive layer provided on a release film may be laminated and filled with the pressure-sensitive adhesive.

<Optical laminate>
10 to 12 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 or both sides of polarizers 40 and 41 with retardation layers shown in FIGS. 1 and 2 and polarizer composites 42 and 43 shown in FIGS. 8 and 9. .

(Optical laminate (1))
Optical laminates 44, 45 shown in FIGS. 10(a) and 10(b) include polarizers 40, 41 with retardation layers shown in FIGS. 1(b) and 2(a), and polarizers 40 with retardation layers shown in FIGS. , 41 and a protective layer 17 provided on the polarizer 10 side. The retardation layer-equipped polarizer 41 may be the retardation layer-equipped polarizer 41 shown in FIGS. 2(b) to 2(e).

The protective layer 17 is a cured product layer of the curable resin (X) contained in the curable resin composition provided directly on the polarizer 10. Examples of the curable resin (X) constituting the protective layer 17, which is a cured product layer, include the curable resin (X) described above. It is preferable that the protective layer 17 is a cured product layer of the same curable resin (X) as the curable resin (X) constituting the cured product contained in the non-polarizing region 12 of the polarizer 10, or the non-polarizing region 12 of the polarizer 10 and the non-retardation region 76 of the retardation layer 71.

When the protective layer 17 is a cured product layer of the same curable resin (X) as the curable resin (X) constituting the cured product of the polarizers 40 and 41 with retardation layers, the protective layer 17 has at least Preferably, the non-polarizing regions 12 are coated. The protective layer 17 may cover at least a portion of one side of the polarizer 10, but preferably covers the entire surface of one side of the polarizer 10.

In order to manufacture the optical laminates 44 and 45, for example, among the methods for manufacturing the polarizers 40 and 41 with retardation layers described above, on the polarizer 10 side of the polarizers 40 and 41 with retardation layers, By coating a curable resin composition and irradiating active energy rays, the curable resin (X) (through-holes 22 of the perforated polarizer 21 or through-holes 22 of the perforated polarizer 21 and perforated retardation (along with the curable resin (X) filled in the through holes 72 of the layer 81) is cured. Thereby, the protective layer 17, which is a layer of cured resin (X), may be formed on the polarizer 10 of the retardation layer-attached polarizer 40, 41 to obtain the optical laminate 44, 45.

Alternatively, when manufacturing the optical laminate 44 shown in FIG. 10(a), the following method may be used. By coating a curable resin composition on the surface of the perforated polarizer 21 of the second laminate 33 (FIG. 4(d)), the curable resin composition is applied to the through holes 22 of the perforated polarizer 21. A coating layer of the curable resin composition is also formed on the surface of the perforated polarizer 21. Thereafter, the curable resin (X) contained in the curable resin composition in the through holes 22 and on the surface of the perforated polarizer 21 is cured by irradiation with active energy rays to form a cured product and a cured product layer. The optical laminate 44 may be obtained by forming the protective layer 17. In this case, the retardation layer 71 may be provided on the opposite side of the polarizer 10 to the side on which the protective layer 17 is formed. Thereby, the cured product contained in the non-polarizing region 12 and the cured product layer constituting the protective layer 17 can be integrated, and the cured product of the curable resin (X) constituting the protective layer 17 can be It can be the same as the cured material contained in the polarizing region 12.

When manufacturing the optical laminate 45 shown in FIG. 10(b), the following method may be used. In the laminate in which the perforated retardation layer 81 and the perforated polarizer 21 are laminated in this order on the fourth support layer described above, the surface of the perforated polarizer 21 is coated with a curable resin composition. As a result, the through holes 22 of the perforated polarizer 21 and the through holes 72 of the perforated retardation layer 81 are filled with the curable resin composition containing the curable resin (X), and the surface of the perforated polarizer 21 is also filled with the curable resin composition. A coating layer of a curable resin composition is formed. Thereafter, by irradiation with active energy rays, the curable resin (X ) may be cured to form a cured product and a protective layer 17 which is a cured product layer to obtain the optical laminate 45. In this case, the cured material contained in the non-polarizing region 12 and the non-retardation region 76 and the cured material layer constituting the protective layer 17 can be integrated, and the curable resin (X) constituting the protective layer 17 can be integrated. can be the same as the curable resin (X) constituting the cured material contained in the non-polarizing region 12 and the non-retardation region 76.

When the protective layer 17, which is a cured material layer, is provided on the polarizer 41 with a retardation layer shown in FIG. A layer 17 may also be provided. Specifically, the thickness of the polarizer 10 shown in FIG. 2(b) is The protective layer 17 may be provided by coating a curable resin composition so as to fill the difference and cover the surface of the polarizing region 11 .

When the protective layer 17, which is a cured material layer, is provided on the polarizer 41 with a retardation layer shown in FIG. 2(d), the polarizer 10 shown in FIG. The protective layer 17 may be provided by coating a curable resin composition on the side where the region 12 protrudes (the upper surface side in FIG. 2(d)) so as to fill the difference in thickness. In this case, the protective layer 17 may or may not cover the surface of the non-polarizing region 12.

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 may be used as the protective layer 17, and the cured product layer of the curable resin (X) may be used as a bonding layer for bonding the protective layer 17 to the polarizer 41 with a retardation layer. The base film may be peeled off after the curable resin (X) is cured.

(Optical laminate (2))
The optical laminates 46, 47 shown in FIGS. 11(a) and 2(b) have protective layers 17, 18 on both sides of the polarizers 40, 41 with retardation layers shown in FIGS. 1(b) and 2(a). has. The optical laminates 46 and 47 may have the protective layer 17 (or 18) only on one side of the polarizers 40 and 41 with retardation layers. The retardation layer-equipped polarizer 41 may be the retardation layer-equipped polarizer 41 shown in FIGS. 2(b) to 2(e).

The protective layers 17 and 18 can be provided on the polarizers 40 and 41 with retardation layers via a bonding layer such as an adhesive layer or an adhesive layer. In this case, for example, film-like protective layers 17 and 18 may be laminated on the retardation layer-equipped polarizers 40 and 41 via a bonding layer. When the optical laminate 47 is one in which the protective layer 17 is provided on the polarizer 10 side of the polarizer 41 with a retardation layer shown in FIG. 2(b) or (d) via a bonding layer, the polarizer It is preferable to provide the protective layer 17 by providing a bonding layer so as to fill the difference in thickness between the polarizing region 11 and the non-polarizing region 12 of 10. When the optical laminate 47 is the one in which the protective layer 18 is provided on the retardation layer 71 side of the retardation layer-attached polarizer 41 shown in FIG. It is preferable to provide the protective layer 18 by providing a bonding layer so as to fill the thickness difference between the retardation region 75 and the non-retardation region 76 of the retardation layer 71 .

The protective layers 17 and 18 may be provided in direct contact with the retardation layer-equipped polarizers 40 and 41 without intervening a bonding layer. The protective layers 17 and 18 provided on the polarizer 10 side of the polarizers 40 and 41 with retardation layers are made of a composition containing a resin material constituting the protective layers 17 and 18, for example. It can be formed by coating on the polarizer 10 or the retardation layers 70 and 71 of No. 41, and solidifying or curing this coating layer. When the optical laminate 47 is one in which the protective layer 17 is provided on the polarizer 10 side of the polarizer 41 with a retardation layer shown in FIG. 2(b) or (d) via a bonding layer, the polarizer It is preferable to form the protective layer 17 by providing a composition containing a resin material constituting the protective layer 17 so as to fill the difference in thickness between the polarizing region 11 and the non-polarizing region 12 of 10. When the optical laminate 47 is the one in which the protective layer 18 is provided on the retardation layer 71 side of the retardation layer-attached polarizer 41 shown in FIG. 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 thickness difference between the retardation region 75 and the non-retardation region 76 of the retardation layer 71.

(Optical laminate (3))
The optical laminates 48, 49 shown in Figs. 12(a) and (b) have protective layers 17, 18 on both sides of the polarizer composites 42, 43 shown in Figs. 8(a) and 9. The optical laminates 48, 49 may have the protective layer 17 (or 18) on only one side of the polarizer composites 42, 43. The protective layer 17, 18 can be provided on the polarizer composites 42, 43 via a bonding layer such as a pressure-sensitive adhesive layer or an adhesive layer. In this case, for example, the film-like protective layer 17, 18 may be laminated on the polarizer composites 42, 43 via a bonding layer. The protective layer 18 provided on the reinforcing material 50 side of the polarizer composites 42, 43 may be laminated by providing a bonding layer so as to fill the internal space of the cells 51 of the reinforcing material 50 and the gaps between the multiple cells 51, for example. Alternatively, a laminated sheet having a coating layer of material that will become the adhesive layer formed on one side of a film-like protective layer can be laminated onto the reinforcing material 50, thereby filling the internal spaces of the cells 51 of the reinforcing material 50 and the gaps between the multiple cells 51 with the material that will become the adhesive layer, thereby forming a protective layer.

The protective layers 17 and 18 may be provided in direct contact with the polarizer composites 42 and 43 without interposing the bonding layer. For example, the protective layers 17 and 18 provided on the polarizer 10 side of the polarizer composites 42 and 43 are coated with a composition containing a resin material constituting the protective layers 17 and 18. It can be formed by coating the coating layer on the substrate 10 and solidifying or curing the coating layer. The protective layer 18 provided on the reinforcing material 50 side of the polarizer composites 42 and 43 is configured so as to fill the internal spaces of the cells 51 of the reinforcing material 50 and the gaps between the plurality of cells 51. The protective layer 18 may be formed by providing a composition containing a resin material.

The protective layer 17 (or 18) provided on one side of the polarizers 40, 41 with retardation layers and the polarizer composites 42, 43 is attached to the polarizers 40, 41 with retardation layers and the polarizer composites 42, 43. When the protective layer 17 (or 18) is a layer provided in direct contact with the non-polarizing region 12 of the polarizer 40 with a retardation layer and the polarizer composite 42, or the polarizer 41 with a retardation layer And it can be a cured product layer of the same curable resin (X) as the curable resin (X) constituting the cured product contained in the non-polarizing region 12 and the non-cell region 56 of the polarizer composite 43. As a result, the cured material contained in the non-polarizing region 12 or the non-polarizing region 12 and the non-cell region 56 is the same as the curable resin (X) constituting the cured material layer constituting the protective layer 17 (or 18). It can be a curable resin (X).

One of the protective layers 17 and 18 may be a protective layer provided through a bonding layer, and the other may be a protective layer provided without a bonding layer. The protective layers 17 and 18 included in the optical laminates 46 to 49 may be the same or different from each other.

When the polarizer composites 42 and 43 have a structure in which reinforcing materials 50 are provided on both sides of the polarizers 40 and 41 with retardation layers, the protective layers 17 and 18 are provided on each of the reinforcing materials 50 on both sides. Just set it up.

(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 44 to 49 and 91 to 94 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 44 to 49 and 91 to 94 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 polarizers 40 and 41 with retardation layers shown in FIGS. 1 and 2, the polarizer composites 42 and 43 shown in FIGS. 8 and 9, and the optical laminates 44 to 49 shown in FIGS. It may have a bonding layer for an optical display element for bonding to an optical display element (liquid crystal panel, organic EL element) of a display device such as a display device or an organic EL display device.

As in the polarizer 41 with a retardation layer shown in FIGS. When a bonding layer for an optical display element is provided on a surface where there is a difference, it is preferable to provide the bonding layer for an optical display element so as to fill this difference in thickness.

In the polarizer composites 42 and 43 and the optical laminates 48 and 49, when a bonding layer for an optical display element is provided on the surface of the reinforcing material 50, the bonding layer for an optical display element is provided as a filler provided in the reinforcing material 50. Filling of the inner spaces of the cells 51 of the reinforcing material 50 with the filler and formation of the bonding layer for an optical display element may be performed at the same time.

10 polarizer, 11 polarizing region, 11m first plane, 11n second plane, 12 non-polarizing region, 17, 18 protective layer, 20 raw 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 third laminate, 35 fourth laminate, 36 through hole, 37 fifth laminate, 40, 41 polarizer with retardation layer, 42, 43 polarizer composite, 44-49 optical laminate, 50 reinforcing material, 51 cell, 53 cell partition, 70, 71 retardation layer, 72 through hole, 75 retardation region, 76 non-retardation region, 80 polymerized cured layer with substrate layer, 81 perforated retardation layer, 84 substrate layer, 85 polymerized cured layer.

Claims (15)

An optical laminate having a protective layer on one side or both sides of a polarizer composite,
The polarizer composite includes a polarizer with a retardation layer and a reinforcing material,
The polarizer with a retardation layer includes:
comprising a polarizer and a retardation layer provided on one side of the polarizer,
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 non-polarizing region is a region in which a cured product of an active energy ray-curable resin is provided in a through hole surrounded by the polarizing region in a plan view ,
The reinforcing material is provided on the retardation layer side of the polarizer with a retardation layer, and has a plurality of cells arranged such that each opening end face faces the surface of the polarizer,
The protective layer is a resin film with a thickness of 20 μm or more,
The shape of the opening of the cell is polygonal, circular, or elliptical,
The protective layer on one side of the polarizer composite covers the entire surface of one side of the polarizer, and is laminated to the polarizer via only an adhesive layer or an adhesive layer. laminate. An optical laminate having a protective layer on one side or both sides of a polarizer composite,
The polarizer composite includes a polarizer with a retardation layer and a reinforcing material,
The polarizer with a retardation layer includes:
comprising a polarizer and a retardation layer provided on one side of the polarizer,
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 non-polarizing region is a region in which a cured product of an active energy ray-curable resin is provided in a through hole surrounded by the polarizing region in a plan view,
The reinforcing material is
provided on the retardation layer side of the polarizer with retardation layer,
having a plurality of cells arranged such that each opening end face faces the surface of the polarizer, and
The cells are provided so as to be present on the entire surface of the retardation layer side of the polarizer with the retardation layer,
The protective layer is a resin film with a thickness of 20 μm or more,
The protective layer on one side of the polarizer composite covers the entire surface of one side of the polarizer, and is laminated to the polarizer via only an adhesive layer or an adhesive layer, an optical laminate. body. The optical laminate according to claim 2 , wherein the opening of the cell has a polygonal, circular or elliptical shape. The optical laminate according to claim 1 , further comprising a light-transmitting filler provided in an internal space of the cell. 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 non-polarizing region and the non-retardation region include a cured product of an active energy ray-curable resin,
According to any one of claims 1 to 4 , the non-retardation region is a region in which a cured product of an active energy ray-curable resin is provided in a through hole surrounded by the retardation region in a plan view. The optical laminate described above. The optical laminate according to claim 5 , wherein the thickness of the cured product is the same as the thickness of a laminated structure portion including the polarizing region and the retardation region in the polarizer with a retardation layer. The optical laminate according to claim 5 , wherein the thickness of the cured product is smaller than a thickness of a laminated structure portion including the polarizing region and the retardation region in the polarizer with a retardation layer. The optical laminate according to claim 5 , wherein the thickness of the cured product is larger than the thickness of a laminated structure portion including the polarizing region and the retardation region in the polarizer with a retardation layer. The optical laminate according to any one of claims 5 to 8 , 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 9 , wherein the non-polarizing region has light-transmitting properties. The optical laminate according to any one of claims 1 to 10 , 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 11 , wherein the active energy ray-curable resin contains an epoxy compound. The optical laminate according to claim 12 , wherein the epoxy compound includes an alicyclic epoxy compound. The optical laminate according to any one of claims 1 to 13, wherein the thickness of the retardation layer is 30 μm or less. The optical laminate according to any one of claims 5 to 9 , wherein the thickness of the retardation region is 15 μm or less.

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