CN114616496A - Polarizing plate, polarizing plate composite, and optical laminate - Google Patents
Polarizing plate, polarizing plate composite, and optical laminate Download PDFInfo
- Publication number
- CN114616496A CN114616496A CN202080074340.2A CN202080074340A CN114616496A CN 114616496 A CN114616496 A CN 114616496A CN 202080074340 A CN202080074340 A CN 202080074340A CN 114616496 A CN114616496 A CN 114616496A
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- polarizing plate
- polarizing
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- curable resin
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- B32B2310/0806—Treatment by energy or chemical effects by wave energy or particle radiation using electromagnetic radiation
Abstract
The polarizing plate has a polarizing region and a non-polarizing region surrounded by the polarizing region in a plan view. The thickness of the polarizing region is 15 μm or less. 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.
Description
Technical Field
The invention relates to a polarizing plate, a polarizing plate composite, and an optical laminate.
Background
Polarizing plates are widely used as supply elements of polarized light in display devices such as liquid crystal display devices and organic Electroluminescence (EL) display devices, and as detection elements of polarized light. Display devices including polarizing plates are also widespread in mobile devices such as notebook personal computers and cellular phones, and polarizing plates having regions of different transmittances are required for diversification of display purposes, clarification of display distinction, decoration, and the like. In particular, in small and medium-sized mobile terminals represented by smartphones and tablet terminals, a polarizing plate may be bonded to the entire display surface in order to form a design without a boundary on the entire surface from the viewpoint of decorative properties. In this case, the polarizing plate may be overlapped in the area of the camera lens or the area where the icon or logo is printed on the screen, and thus there is a problem that the sensitivity of the camera is deteriorated and the design is deteriorated.
For example, patent document 1 describes the following: a low-concentration dichroic material portion having a relatively low content of a dichroic material is locally provided in a polarizing plate included in a polarizing plate, and a camera is disposed in correspondence with the low-concentration dichroic material portion, whereby the performance of the camera is not adversely affected.
Documents of the prior art
Patent document
Patent document 1: japanese laid-open patent publication (Kokai) No. 2015-215609
Disclosure of Invention
Problems to be solved by the invention
In patent document 1, a low-concentration portion of a dichroic substance is formed by partially decoloring a resin film by performing a chemical treatment of bringing an alkaline solution into contact with the resin film containing the dichroic substance. It takes time and cost to treat the alkaline solution used for decoloring as a waste liquid. Patent document 1 describes the following: in the case of using iodine as the dichroic material, the content of iodine can be reduced by contacting with an alkaline solution to form the dichroic material low-concentration portion. However, a specific method of forming a low-concentration portion of a dichroic substance in the case of using a dichroic substance other than iodine is not disclosed.
The purpose of the present invention is to provide a novel polarizing plate, a polarizing plate composite, and an optical laminate, which substitute for a polarizing plate having a region with a low dichroic substance content formed by chemical treatment such as decolorization.
Means for solving the problems
The invention provides the following polarizing plate, polarizing plate complex and optical laminate.
[ 1] A polarizing plate having a polarizing region and a non-polarizing region surrounded by the polarizing region in a plan view, wherein the polarizing region has a thickness of 15 μm or less,
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 polarizing plate according to [ 1], wherein the thickness of the cured product is the same as the thickness of the polarizing region.
A polarizing plate according to [ 1], wherein the thickness of the cured product is smaller than the thickness of the polarizing region.
The polarizing plate according to [ 1], wherein the cured product has a thickness larger than that of the polarizing region.
The polarizing plate according to any one of [ 1] to [ 4], wherein the unpolarized region has a light-transmitting property.
The polarizing plate according to any one of [ 1] to [ 5], wherein the unpolarized region has a diameter of 0.5mm to 20mm in a plan view.
The polarizing plate according to any one of [ 1] to [ 6], wherein the active energy ray-curable resin contains an epoxy compound.
The polarizing plate according to [ 8] above [ 7], wherein the epoxy compound comprises an alicyclic epoxy compound.
[ 9] A polarizing plate composite comprising the polarizing plate according to any one of [ 1] to [ 8] and a reinforcing material provided on at least one surface side of the polarizing plate,
the reinforcing material has a plurality of cells arranged such that each open end face faces the surface of the polarizing plate.
[ 10] the polarizing plate composite according to [ 9], wherein the shape of the opening of the cell is a polygon, a circle or an ellipse.
[ 11] the polarizing plate composite according to [ 9] or [ 10], wherein a light-transmitting filler is further provided in the inner space of the cell.
An optical laminate comprising a polarizing plate according to any one of [ 1] to [ 8] or a polarizing plate composite according to any one of [ 9] to [ 11] and a protective layer on at least one surface side.
The optical laminate according to [ 12 ], wherein the protective layer is a cured layer of an active energy ray-curable resin provided on the polarizing plate.
The optical laminate according to [ 14 ] above [ 13 ], wherein the active energy ray-curable resin constituting the protective layer is the same active energy ray-curable resin as that constituting the cured product contained in the polarizing region.
Effects of the invention
According to the present invention, a novel polarizing plate, a polarizing plate composite, and an optical laminate can be provided.
Drawings
Fig. 1 (a) is a schematic plan view schematically showing an example of the polarizing plate of the present invention, and fig. 1 (b) to (d) are z-z' sectional views of the polarizing plate shown in fig. 1 (a).
Fig. 2 (a) and (b) are views schematically showing an example of a cross section around the non-polarizing region of the polarizing plate, and are explanatory views for explaining a method of determining the thickness of a cured product provided in the non-polarizing region.
Fig. 3 (a) to (e) are schematic cross-sectional views schematically showing an example of the method for producing a polarizing plate of the present invention.
Fig. 4 (a) is a schematic cross-sectional view schematically showing an example of the polarizing plate composite of the present invention, and fig. 4 (b) is a schematic plan view of the reinforcing material side of the polarizing plate composite shown in fig. 4 (a).
Fig. 5 (a) to (c) are schematic cross-sectional views schematically showing an example of the optical laminate of the present invention.
Fig. 6 is a schematic cross-sectional view schematically showing another example of the optical laminate of the present invention.
Fig. 7 is a schematic cross-sectional view schematically showing still another example of the optical laminate of the present invention.
Fig. 8 is a schematic cross-sectional view schematically showing still another example of the optical laminate of the present invention.
Detailed Description
Preferred embodiments of the polarizing plate, the polarizing plate composite, and the optical laminate according to the present invention will be described below with reference to the drawings. In all the drawings below, the scale of each component shown in the drawings is appropriately adjusted to facilitate understanding of each component, and the scale of each component does not necessarily coincide with the scale of the actual component.
< polarizing plate >
Fig. 1 (a) is a schematic plan view schematically showing an example of the polarizing plate of the present embodiment, and fig. 1 (b) to (d) are z-z' sectional views of the polarizing plate shown in fig. 1 (a). The polarizing plate 10 shown in fig. 1 (a) to (d) includes a polarizing region 11 and a non-polarizing region 12 surrounded by the polarizing region 11 in a plan view. The thickness of the polarizing region 11 is 15 μm or less. The non-polarizing region 12 is a region in which a cured product of an active energy ray-curable resin (hereinafter, may be referred to as "curable resin (X)") is provided in the through hole 22 surrounded by the polarizing region 11 in a plan view.
The polarizing plate 10 includes a non-polarizing region 12 surrounded by a polarizing region 11 in a plan view, as shown in fig. 1 (a). Therefore, when the polarizing plate 10 is applied to a display device such as a liquid crystal display device or an organic EL display device which is widely used in a smartphone or a tablet terminal, a decrease in sensitivity and a decrease in design of a camera can be suppressed by disposing a printing portion such as a camera lens, an icon, or a logo in correspondence with the non-polarizing region 12.
In the polarizing plate 10, since the cured product of the curable resin (X) is provided in the through-hole 22, the non-polarizing region 12 can be made solid. Since the thickness of the polarizing plate 10 is as thin as 15 μm or less, if a cured product of the curable resin (X) is not provided in the non-polarizing region 12 and the through-hole 22 is in a hollow state, there is a possibility that defects such as cracks may occur around the through-hole 22 due to shrinkage of the polarizing plate caused by a temperature change to which the polarizing plate is exposed when used in a display device or the like. On the other hand, by providing a cured product of the curable resin (X) in the through-hole 22 like the polarizer 10, the non-polarizing region 12 can be made solid, and thus the occurrence of the above-described problem can be suppressed.
The polarizing region 11 and the non-polarizing region 12 in the polarizing plate 10 are not particularly limited as long as the polarizing region 11 surrounds the non-polarizing region 12. The total area occupied by the polarizing regions 11 is preferably larger than the total area occupied by the non-polarizing regions 12 when the polarizing plate 10 is viewed in plan. The polarizing plate 10 may have 1 unpolarized region 12, or may have 2 or more unpolarized regions 12. In the case of having 2 or more non-polarizing regions 12, the shapes of the respective non-polarizing regions 12 may be the same as each other, or may be different from each other.
The polarizing plate 10 may be a single sheet or an elongated body having a length that is wound into a roll shape during storage, transportation, or the like. The planar shape and size of the polarizing plate 10 are not particularly limited, and are determined according to the size of a display device to which the polarizing plate 10 is applied.
(polarizing region)
The polarizing region 11 of the polarizing plate 10 preferably exhibits absorption dichroism at a wavelength ranging from 380nm to 780 nm. The polarizing plate 10 has a property of absorbing linearly polarized light having a vibration plane parallel to the absorption axis thereof and transmitting linearly polarized light having a vibration plane orthogonal to the absorption axis (parallel to the transmission axis), and this property can be obtained mainly by the polarizing region 11.
The polarization region 11 may use, for example: films obtained by adsorbing and orienting a dichroic substance such as iodine or a dichroic dye on a hydrophilic polymer film such as a polyvinyl alcohol film, a partially acetalized polyvinyl alcohol film, or an ethylene-vinyl acetate copolymer partially saponified film; and a polyene-based alignment film or a film in which a liquid crystal compound is aligned, which is obtained by adsorbing and aligning a dichroic material to a dehydrated polyvinyl alcohol or a desalted polyvinyl chloride. Among these, as a film having excellent optical properties, a film obtained by dyeing a polyvinyl alcohol film with iodine and uniaxially stretching the dyed film is preferably used.
First, a method for producing a film obtained by uniaxially stretching a polyvinyl alcohol film dyed with iodine, which is a preferable polarizing region 11, will be briefly described.
The dyeing with iodine is performed by, for example, immersing a polyvinyl alcohol film in an aqueous iodine solution. The stretching ratio of the uniaxial stretching is preferably 3 to 7 times. The stretching may be performed after the dyeing treatment, or may be performed while dyeing. In addition, dyeing may be performed after stretching.
The polyvinyl alcohol film is subjected to swelling treatment, crosslinking treatment, washing treatment, drying treatment, and the like as necessary. For example, by immersing the polyvinyl alcohol film in water and washing with water before dyeing, not only dirt and an antiblocking agent on the surface of the polyvinyl alcohol film can be washed, but also the polyvinyl alcohol film can be swollen to prevent uneven dyeing and the like.
The stretching treatment, dyeing treatment, crosslinking treatment (boric acid treatment), washing treatment, and drying treatment of the polyvinyl alcohol resin film can be performed, for example, according to the method described in japanese patent laid-open No. 2012-159778. In the method described in this document, a polyvinyl alcohol resin is applied to a base film to form a polyvinyl alcohol resin layer to be the polarizing region 11. In this case, the substrate film used may be used as the 1 st support layer 25 described later.
Next, the polarizing region 11 in which a dichroic dye is adsorbed and aligned to a film in which a liquid crystal compound is aligned will be briefly described. As the polarizing region 11 in this case, for example, as described in japanese patent laid-open nos. 2013-37353, 2013-33249, 2016-170368, and 2017-83843, a film in which a dichroic dye is aligned in a cured film obtained by polymerizing a liquid crystal compound can be used. As the dichroic dye, a dichroic dye having absorption in a wavelength range of 380 to 800nm can be used, and an organic dye is preferably used. Examples of the dichroic dye include azo compounds. The liquid crystal compound is a liquid crystal compound capable of being polymerized in an aligned state, and may have a polymerizable group in a molecule. The cured film obtained by polymerizing the liquid crystal compound may be formed on a base film, and in this case, the base film may be used as the 1 st support layer 25 described later.
It is also preferable that the polarizing film for the polarizing region 11 is produced as described above, and then the non-polarizing region 12 is formed by punching to form the polarizing plate 10. In the present specification, such a polarizing film formed only of the polarizing region 11 is sometimes referred to as a raw polarizing plate 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 monomer transmittance (Ts) of the polarizing region 11 is usually less than 50%, and may be 46% or less. The monomer transmittance (Ts) of the polarizing region 11 is preferably 39% or more, more preferably 39.5% or more, further preferably 40% or more, and particularly preferably 40.5% or more.
The monomer transmittance (Ts) is a Y value obtained by measuring and correcting visibility in accordance with JIS Z8701 with a 2-degree field of view (C light source). The visibility-corrected polarization degree (Py) can be determined by the following formula based on the visibility-corrected parallel transmittance Tp and orthogonal transmittance Tc, and can be measured, for example, using an ultraviolet-visible spectrophotometer (product name: V7100, manufactured by japan spectrographs).
Py[％]＝{(Tp-Tc)/(Tp+Tc)}1/2×100
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, workability for providing an active energy ray curable resin composition containing a curable resin (X) described later in the non-polarizing region 12 is likely to be lowered. In addition, when the polarization region 11 is smaller than the above range, it is difficult to obtain desired optical characteristics. The thickness of the polarizing region 11 can be measured, for example, by using a contact type film thickness measuring apparatus (MS-5C, manufactured by Nikon K.K.).
(unpolarized region)
In general, "unpolarized light" refers to light without regularity that can be observed in the electric field component. In other words, unpolarized light refers to random light in which a predominantly specific polarization state is not observed. The "partially polarized light" refers to light in an intermediate state between polarized light and unpolarized light, and refers to light obtained by mixing at least 1 of linearly polarized light, circularly polarized light, and elliptically polarized light with unpolarized light. The non-polarizing region 12 in the polarizing plate 10 refers to a region where light transmitted through the non-polarizing region 12 (transmitted light) becomes non-polarized light or partially polarized light. In particular, the transmission light is preferably an unpolarized region of unpolarized light.
The non-polarizing region 12 of the polarizing plate 10 is a region surrounded by the polarizing region 11 in a plan view.
The non-polarizing region 12 contains a cured product of the curable resin (X). The non-polarizing region 12 is preferably a region in which a cured product of an active energy ray-curable resin composition containing a curable resin (X) described later is provided in a through hole provided in a polarizing plate (raw material polarizing plate 20) formed only of the polarizing region 11. The unpolarized region 12 has light transmittance. In the present specification, the light transmittance refers to a property (transmittance) that visible light having a wavelength of 400nm to 700nm transmits 80% or more, preferably 85% or more, more preferably 90% or more, and still more preferably 92% or more. The following definition of "light transmittance" and preferred ranges of transmittance for visible light are also the same as described above.
By providing the non-polarizing region 12 of the polarizing plate 10 with light transmittance, optical transparency can be secured in the non-polarizing region 12. Thus, when the polarizing plate 10 is applied to a display device, a camera lens, a printed portion such as an icon or a logo is disposed so as to correspond to the non-polarizing region 12, whereby a decrease in sensitivity and a decrease in design of the camera can be suppressed.
The plane shape of the non-polarizing region 12 is not particularly limited, and may be a circle; an oval shape; coin shape (Japanese original: small judgment shape); polygons such as triangles and quadrilaterals; at least 1 corner of the polygon is a rounded polygon with rounded corners (having the shape of R), etc.
The diameter of the non-polarizing region 12 is preferably 0.5mm or more, and may be 1mm or more, 2mm or more, and may be 3mm or more. The diameter of the non-polarizing region 12 is preferably 20mm or less, and may be 15mm or less, or may be 10mm or less, or may be 7mm or less. The diameter of the non-polarizing region 12 is the length of the longest straight line among straight lines connecting two arbitrary 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 (fig. 1 (b)), may be smaller than the thickness of the polarizing region 11 (fig. 1 (c)), or may be larger than the thickness of the polarizing region 11 (fig. 1 (d)). The cured product of the curable resin (X) provided in the unpolarized region 12 is preferably provided so as to fill the entire through-hole 22.
The thickness of the cured product of the unpolarized region 12 was determined as follows. First, in the polarizing plate 10, a 1 st plane including one surface of the polarizing region 11 and a 2 nd plane including the other surface are assumed. Next, in the non-polarizing region 12, the 1 st position, which is the position where the shortest distance between the surface of the cured product on the one surface side and the 1 st plane is the largest, and the 2 nd position, which is the position where the shortest distance between the surface of the cured product on the other surface side and the 2 nd plane is the largest, are determined. Then, the sum of the shortest distance (dm) at the 1 st position, the shortest distance (dn) at the 2 nd position, and the distance (D) between the 1 st plane and the 2 nd plane (dm + dn + D) was defined as the thickness of the cured product in the non-polarizing region 12.
The method of determining the thickness of the cured product provided in the non-polarizing region 12 when the thickness is different from that of the polarizing region 11 will be specifically described with reference to fig. 2. Fig. 2 (a) and (b) are views schematically showing an example of a cross section around the non-polarizing region of the polarizing plate, and are explanatory views for explaining a method of determining the thickness of a cured product provided in the non-polarizing region.
As shown in fig. 2 (a), when a cured product is provided in the non-polarizing region 12, a straight line indicated by a one-dot chain line extending along one surface side of the polarizing region 11 and located in the non-polarizing region 12 is assumed as the 1 st plane 11 m. The position where the length of a straight line (dm in fig. 2 (a)) is the maximum among straight lines connecting an arbitrary point on the 1 st plane 11m and an arbitrary point on the surface of the cured product disposed in the non-polarizing region 12, the straight line having the shortest distance is the 1 st position. Next, as shown in fig. 2 (a), a straight line shown by a one-dot chain line along the other surface side of the polarizing region 11 and located in the non-polarizing region 12 is assumed as a 2 nd plane 11 n. The position at which the length of a straight line ("dn" in fig. 2 (a)) connecting an arbitrary point on the 2 nd plane 11n and an arbitrary point on the surface of the cured product disposed in the non-polarizing region 12 becomes the maximum among straight lines having the shortest distance therebetween is the 2 nd position. Here, as shown in fig. 2 (a), when the surface of the cured product provided in the non-polarizing region 12 is present on the inner surface side (the polarizing plate 10 side) of the 1 st plane 11m and the 2 nd plane 11n in the thickness direction of the polarizing plate 10, dm and dn are represented by negative values. The distance between the 1 st plane 11m and the 2 nd plane 11n is D. Thus, the thickness of the cured product provided in the unpolarized region 12 shown in FIG. 2 (a) can be defined as D + dm + dn (negative values of dm and dn).
In addition, as shown in fig. 2 (b), even when a cured product is provided in the non-polarizing region 12, the thickness of the cured product provided in the non-polarizing region 12 can be determined by assuming the 1 st plane 11m and the 2 nd plane 11n, as described above. Specifically, first, the position at which the length of a straight line ("dm" in fig. 2 (b)) connecting an arbitrary point on the 1 st plane 11m and an arbitrary point on the surface of the cured product disposed in the non-polarizing region 12 becomes the maximum among straight lines having the shortest distance therebetween is defined as the 1 st position. Next, of the straight lines that connect an arbitrary point on the 2 nd plane 11n and an arbitrary point on the surface of the cured product disposed in the non-polarizing region 12, the position at which the length ("dn" in fig. 2 (b)) of the straight line becomes the maximum is defined as the 2 nd position.
Here, as shown in fig. 2 (b), when the surface of the cured product provided in the non-polarizing region 12 is present on the outer surface side (the side opposite to the polarizing plate 10) of the 1 st plane 11m and the 2 nd plane 11n in the thickness direction of the polarizing plate 10, dm and dn are represented by positive values. Thus, the thickness of the cured product provided in the unpolarized region 12 shown in FIG. 2 (b) can be defined as D + dm + dn (where dm and dn are positive values).
(active energy ray-curable resin composition (curable resin composition))
The non-polarizing region 12 in the polarizing plate 10 is a region in which a cured product of an active energy ray-curable resin (X)) is provided as described above, and is preferably formed of an active energy ray-curable resin composition (hereinafter, may be referred to as "curable resin composition") containing the curable resin (X). The curable resin (X) contained in the curable resin composition 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 light. The curable resin composition containing the curable resin (X) may be an active energy ray-curable adhesive, and in this case, an ultraviolet-curable adhesive is more preferable.
The curable resin composition is preferably solvent-free. The solvent-free type means that a solvent is not positively added, and specifically, the solvent-free curable resin composition means that the content of the solvent is 5% by weight or less with respect to 100% by weight of the curable resin (X) contained in the curable resin composition.
The curable resin (X) preferably contains an epoxy compound. The epoxy compound is a compound having 1 or more, preferably 2 or more epoxy groups in the molecule. Examples of the epoxy compound include alicyclic epoxy compounds, aliphatic epoxy compounds, and hydrogenated epoxy compounds (glycidyl ethers of polyhydric alcohols having an alicyclic ring). The epoxy compound contained in the curable resin (X) may be 1 kind or 2 or more kinds.
The content of the epoxy compound is preferably 40% by weight or more, more preferably 50% by weight or more, and further preferably 60% by weight or more, based on 100% by weight of the curable resin (X). The content of the epoxy compound may be 100% by weight or less, 90% by weight or less, 80% by weight or less, or 75% by weight or less based on 100% by weight of the curable resin (X).
The epoxy equivalent of the epoxy compound is usually 40 to 3000 g/equivalent, preferably 50 to 1500 g/equivalent. If the epoxy equivalent exceeds 3000 g/equivalent, compatibility with other components contained in the curable resin (X) may be lowered.
The epoxy compound contained in the curable resin (X) preferably contains an alicyclic epoxy compound. The alicyclic epoxy compound is an epoxy compound having 1 or more epoxy groups bonded to an alicyclic ring in a molecule. The "epoxy group bonded to an alicyclic ring" refers to a bridged oxygen atom-O-in the structure represented by the following formula. In the formula, m is an integer of 2 to 5.
[ chemical formula 1]
Removing (CH) in the above formula2)mThe compound in which 1 or more hydrogen atoms in the formula (b) are bonded to other chemical structures may be an alicyclic epoxy compound. (CH)2)m1 or more of the hydrogen atoms in (b) may be appropriately substituted with a linear alkyl group such as a methyl group or an ethyl group. Among the alicyclic epoxy compounds, an epoxy compound having an oxabicyclohexane ring (an epoxy compound having m ═ 3 in the above formula) or an oxabicycloheptane ring (an epoxy compound having m ═ 4 in the above formula) is preferably used because it imparts excellent adhesion between the polarizing region 11 of the polarizing plate 10 and the cured product of the curable resin (X) forming the non-polarizing region 12. The alicyclic epoxy compound to be preferably used is specifically exemplified below, but is not limited to these compounds.
[a] Epoxycyclohexanecarboxylic acid epoxycyclohexylmethyl esters represented by the following formula (IV):
[ chemical formula 2]
[ in the formula (IV), R8And R9Each independently represents a hydrogen atom or a linear alkyl group having 1 to 5 carbon atoms.]
[b] Epoxycyclohexanecarboxylic acid esters of alkanediols represented by the following formula (V):
[ chemical formula 3]
[ in the formula (V), R10And R11Each independently represents a hydrogen atom or a linear alkyl group having 1 to 5 carbon atoms, and n represents an integer of 2 to 20.]
[c] Epoxycyclohexylmethyl esters of dicarboxylic acids represented by the following formula (VI):
[ chemical formula 4]
[ in the formula (VI), R12And R13Each independently represents a hydrogen atom or a linear alkyl group having 1 to 5 carbon atoms, and p represents an integer of 2 to 20.]
[d] Epoxycyclohexylmethyl ethers of polyethylene glycols of the formula (VII):
[ chemical formula 5]
[ in the formula (VII), R14And R15Each independently represents a hydrogen atom or a linear alkyl group having 1 to 5 carbon atoms, and q represents an integer of 2 to 10.]
[e] Epoxycyclohexylmethyl ethers of alkanediols represented by the following formula (VIII):
[ chemical formula 6]
[ in the formula (VIII), R16And R17Each independently represents a hydrogen atom or a linear alkyl group having 1 to 5 carbon atoms, and r represents an integer of 2 to 20.]
[f] A diepoxyltrirocyclic compound represented by the following formula (IX):
[ chemical formula 7]
[ in the formula (IX), R18And R19Each independently represents a hydrogen atom or a linear alkyl group having 1 to 5 carbon atoms.]
[g] A diepoxy monoaspiro compound represented by the following formula (X):
[ chemical formula 8]
[ in the formula (X), R20And R21Each independently represents a hydrogen atom or a linear alkyl group having 1 to 5 carbon atoms.]
[h] Vinylcyclohexene diepoxides of the following formula (XI):
[ chemical formula 9]
[ in the formula (XI), R22Represents a hydrogen atom or a linear alkyl group having 1 to 5 carbon atoms.]
[i] Epoxycyclopentyl ethers of the following formula (XII):
[ chemical formula 10]
[ in the formula (XII), R23And R24Each independently represents hydrogenAn atom or a linear alkyl group having 1 to 5 carbon atoms.]
[j] Diepoxy tricyclodecanes represented by the following formula (XIII):
[ chemical formula 11]
[ in the formula (XIII), R25Represents a hydrogen atom or a linear alkyl group having 1 to 5 carbon atoms.]
Examples of the aliphatic epoxy compound include polyglycidyl ethers of aliphatic polyhydric alcohols or alkylene oxide adducts thereof. More specifically, there may be mentioned diglycidyl ether of 1, 4-butanediol; a diglycidyl ether of 1, 6-hexanediol; triglycidyl ethers of glycerol; triglycidyl ether of trimethylolpropane; diglycidyl ethers of polyethylene glycol; a diglycidyl ether of propylene glycol; polyglycidyl ethers of polyether polyols obtained by adding 1 or 2 or more kinds of alkylene oxides (ethylene oxide, propylene oxide) to aliphatic polyols such as ethylene glycol, propylene glycol, and glycerin.
The hydrogenated epoxy compound is obtained by reacting epichlorohydrin with an alicyclic polyol obtained by hydrogenating an aromatic ring of an aromatic polyol. Examples of the aromatic polyol include bisphenol compounds such as bisphenol a, bisphenol F, and bisphenol S; novolac resins such as phenol novolac resin, cresol novolac resin, hydroxybenzaldehyde phenol novolac resin, and the like; and polyfunctional compounds such as tetrahydroxydiphenylmethane, tetrahydroxybenzophenone, and polyvinyl phenol. Preferred examples of the hydrogenated epoxy compound include hydrogenated diglycidyl ethers of bisphenol A.
The curable resin (X) may contain a (meth) acrylic compound and the like together with an active energy ray-curable compound such as an epoxy compound. By using the (meth) acrylic compound in combination, effects of improving the adhesion between the polarizing region 11 of the polarizing plate 10 and the cured product of the curable resin (X) forming the non-polarizing region 12, and the hardness and mechanical strength of the cured product of the curable resin (X) can be expected, and further, adjustment of the viscosity, curing speed, and the like of the curable resin (X) can be performed more easily. "(meth) acrylic acid" means at least one selected from acrylic acid and methacrylic acid.
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 cationic photopolymerization agents and radical polymerization initiators. The photo cation polymerization initiator generates a cation species or lewis acid by irradiation of active energy rays such as visible rays, ultraviolet rays, X-rays, electron beams, and the like, and initiates a polymerization reaction of an epoxy group. As described 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, and therefore, the polymerization initiator in this case is preferably a polymerization initiator that generates a cationic species or a lewis acid by irradiation with ultraviolet rays.
The curable resin composition may further contain additives such as photosensitizers, polymerization accelerators, ion scavengers, antioxidants, chain transfer agents, tackifiers, thermoplastic resins, fillers, flow control agents, plasticizers, defoaming agents, antistatic agents, and leveling agents.
(method for producing polarizing plate)
Fig. 3 (a) to (e) are schematic cross-sectional views schematically showing an example of a method for manufacturing a polarizing plate according to the present embodiment. In fig. 3, (a) to (e) show the case where the polarizing plate 10 shown in fig. 1 (b) is obtained, but the polarizing plate 10 shown in fig. 1 (c) and (d) may be manufactured by the method described below. The polarizing plate 10 can be manufactured using, for example, a raw material polarizing plate 20 having the same visibility correction polarization degree (Py) as a whole and having no unpolarized region 12. Since the raw material polarizing plate 20 is formed only by the polarizing regions 11 of the polarizing plate 10, the thickness of the raw material polarizing plate 20 is preferably equal to or less than 15 μm, which is the same thickness as the polarizing regions 11 of the polarizing plate 10.
The polarizing plate 10 can be manufactured by the following steps, for example. First, as shown in fig. 3 (a), a 1 st laminate 31 in which a 1 st support layer 25 is provided on one surface of a raw material polarizing plate 20 so as to be peelable from the raw material polarizing plate 20 is prepared. The prepared 1 st laminated body 31 is formed with a through hole 32 penetrating in the lamination direction by punching, shearing, cutting, laser cutting, or the like (fig. 3 (b)). Thus, an apertured polarizing plate 21 having through holes 22 formed in the raw polarizing plate 20 was obtained. Next, after the 2 nd support layer 26 is provided in a releasable manner on the apertured polarizing plate 21 side of the 1 st laminate 31 in which the through-holes 32 are formed (fig. 3 (c)), the 1 st support layer 25 is peeled off (fig. 3 (d)). Thus, a 2 nd laminate 33 in which the 2 nd support layer 26 and the apertured polarizing plate 21 are laminated is obtained (fig. 3 (d)). The 2 nd support layer 26 is provided so as to close one side of the through-hole 22 of the apertured polarizing plate 21.
Next, the through-holes 22 of the apertured polarizing plate 21 of the 2 nd laminate 33 are filled with a curable resin composition containing a curable resin (X), and the curable resin (X) in the through-holes 22 is cured by irradiation with active energy rays. Thus, a cured product of the curable resin (X) is formed in the through-hole 22 of the apertured polarizing plate 21, and the polarizing plate 10 laminated on the 2 nd support layer 26 is obtained ((e) of fig. 3).
After the cured product is formed, the 2 nd support layer 26 may be peeled off. In the polarizing plate 10 obtained, the region other than the through-hole 22 of the apertured polarizing plate 21 was the polarizing region 11, and the region provided with the through-hole 22 of the cured product was the non-polarizing region 12.
The method for filling the curable resin composition into the through-hole 22 of the apertured polarizing plate 21 is not particularly limited. For example, the curable resin composition may be injected into the through-hole 22 of the apertured polarizing plate 21 of the 2 nd laminate 33 using a dispenser or the like, or the curable resin composition may be injected into the through-hole 22 of the apertured polarizing plate 21 while applying the curable resin composition to the surface of the apertured polarizing plate 21 of the 2 nd laminate 33. The cured product layer of the curable resin composition applied to the surface of the aperture polarizing plate 21 may be a protective layer described later. In the case of applying the curable resin composition, the base material film may be provided so as to cover the surface of the coating layer formed by the application. The substrate film may be used as a protective layer described later, and in this case, the cured product layer of the curable resin (X) may be used as a bonding layer for bonding the protective layer described later. The substrate film may be peeled off after curing of the curable resin (X) contained in the curable resin composition.
The 1 st support layer 25 may be a support layer used in the production of the raw polarizing plate 20, or the above-described substrate film used in the application of the curable resin composition may be used. Alternatively, the pressure-sensitive adhesive sheet may be a releasable support layer that is bonded to the raw material polarizing plate 20 with a volatile liquid such as water, or may be a pressure-sensitive adhesive sheet that is releasable from the raw material polarizing plate 20. The 2 nd support layer 26 may be a releasable support layer that is bonded to the apertured polarizing plate 21 with a volatile liquid such as water, or may be an adhesive sheet that is releasable from the apertured polarizing plate 21.
As described above, by setting the thickness of the raw material polarizing plate 20 to 15 μm or less, the depth of the through-hole 22 provided in the apertured polarizing plate 21 can be set to 15 μm or less. This makes it possible to fill the through-holes 22 of the apertured polarizing plate 21 with the curable resin composition and to cure the curable resin (X) contained in the curable resin composition filled in the through-holes 22 in a short time, and therefore, the reduction in workability can be suppressed.
(raw material polarizing plate)
The raw material polarizing plate 20 is preferably not significantly denatured by active energy rays irradiated for curing the curable resin (X) in the curable resin composition filled in the through-holes 22. The raw material polarizing plate 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, and the production method thereof is as described above for the polarizing region 11.
< polarizer composite >
Fig. 4 (a) is a schematic cross-sectional view schematically showing an example of the polarizing plate composite of the present embodiment, and fig. 4 (b) is a schematic plan view of the reinforcing material side of the polarizing plate composite. In fig. 4 (b), the non-polarizing region 12 of the polarizing plate 10 is represented by a wavy line. The polarizing plate composite 41 shown in fig. 4 (a) includes a polarizing plate 10 and a reinforcing material 50 provided on one surface side of the polarizing plate 10. The reinforcing material 50 may be disposed on both sides of the polarizer 10.
In the polarizing plate composite 41, the reinforcing material 50 has a plurality of cells 51 arranged such that each open end face faces the surface of the polarizing plate 10. The cells 51 have a hollow columnar (cylindrical) structure surrounded by cell partition walls 53 that partition the cells 51, and both axial ends of the columnar structure become open end faces.
In the polarizing plate composite 41, as shown in fig. 4 (a), the reinforcing material 50 is preferably provided so that the cells 51 are present in the region of the polarizing plate 10 corresponding to the non-polarizing region 12 and the periphery thereof, and more preferably, so that the cells 51 are present in the entire surface of the polarizing plate 10.
Since the polarizing plate 10 has the non-polarizing region 12, it is considered that cracks are likely to occur around the non-polarizing region 12 due to shrinkage of the polarizing plate 10 caused by a temperature change when applied to a display device or the like. In addition, since the polarizing plate 10 has a thickness of the polarizing region 11 as thin as 15 μm or less, it is considered that cracks are likely to occur when an impact is applied. In the polarizing plate composite 41, since the reinforcing material 50 is provided on one surface of the polarizing plate 10 as described above, it is considered that the generation of cracks and the development of fine cracks into large cracks can be suppressed when the polarizing plate is subjected to a temperature change or an impact.
The polarizing plate complex 41 shown in fig. 4 (a) has the polarizing plate 10 and the reinforcing material 50 shown in fig. 1 (b), respectively, but is not limited thereto. For example, the polarizing plate 10 included in the polarizing plate composite 41 may be the polarizing plate 10 shown in fig. 1 (c) or (d).
The reinforcing material 50 is applied to a display device or the like together with the polarizing plate 10. If the internal space of the cells 51 of the reinforcing material 50 is hollow, the visibility of the display device may be reduced due to a difference in refractive index between the cell partition walls 53 and the internal space of the cells 51, or the like. Therefore, it is preferable to provide a light-transmitting filler in the internal space of the cells 51 of the reinforcing material 50 in the polarizer composite 41. In the reinforcing material 50 of the polarizer composite 41, when a gap is provided between the plurality of cells 51 as described later, it is preferable that a light-transmitting filler is also provided in the gap.
The filler that can be provided in the reinforcing material 50 is not particularly limited as long as it has light transmittance and can fill the internal space of the cells 51 of the reinforcing material 50. The filler material is preferably a material different from the material constituting the cell partition walls 53 of the reinforcing material 50, and more preferably contains a resin material. Examples of the resin material include 1 or more selected from a thermoplastic resin, a thermosetting resin, a curable resin such as an active energy ray-curable resin, and the like, and may be an adhesive or an adhesive.
Examples of the thermoplastic resin 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; polyester resins such as polyethylene terephthalate, polyethylene naphthalate and polybutylene terephthalate; a polycarbonate-based resin; (meth) acrylic resins; a polystyrene-based resin; a polyether resin; a polyurethane resin; a polyamide resin; a polyimide-based resin; fluorine-based resins, and the like.
Examples of the curable resin include the curable resin (X) described above.
The pressure-sensitive adhesive exhibits adhesiveness by attaching itself to an adherend, and is called a so-called pressure-sensitive adhesive. Examples of the adhesive include adhesives containing a polymer such as a (meth) acrylic polymer, a silicone polymer, a polyester polymer, a polyurethane polymer, a polyether polymer, or a rubber polymer as a main component.
In the present specification, the main component means a component contained in an amount of 50 mass% or more based on the total solid content of the binder. The binder may be an active energy ray-curable type or a thermosetting type, and the crosslinking degree and the adhesive strength may be adjusted by irradiation with an active energy ray or heating.
The adhesive contains a curable resin component and is an adhesive other than a pressure-sensitive adhesive (pressure-sensitive adhesive). Examples of the adhesive include an aqueous adhesive in which a curable resin component is dissolved or dispersed in water, an active energy ray-curable adhesive containing an active energy ray-curable compound, and a thermosetting adhesive.
As the adhesive, a water-based adhesive commonly used in the technical field of polarizing plates may be used.
Examples of the resin component contained in the aqueous adhesive include a polyvinyl alcohol resin and a urethane resin. Examples of the active energy ray-curable adhesive 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 curable resin (X) can be used. Examples of the thermosetting adhesive include thermosetting adhesives containing an epoxy resin, a silicone resin, a phenol resin, a melamine resin, or the like as a main component.
(reinforcing Material)
As described above, the cells 51 of the reinforcing material 50 have a hollow columnar (cylindrical) structure surrounded by the cell partition walls 53 that partition the cells 51, and both axial ends of the columnar structure become open end faces. The cell 51 has a 1 st open end face disposed on a relatively near side to the distance from the polarizer 10 of the polarizer composite 41 and a 2 nd open end face disposed on a relatively far side as open end faces. The reinforcing material 50 may be arranged such that at least one of the 1 st opening end face and the 2 nd opening end face faces the polarizing plate 10, and preferably both the 1 st opening end face and the 2 nd opening end face the polarizing plate 10.
The shape of the opening of the cell 51 provided in the reinforcing material 50 is not particularly limited, and is preferably a polygon, a circle, or an ellipse. The shape of the opening on the 1 st opening end surface and the shape of the opening on the 2 nd opening end surface are preferably the same shape with the same size, but may be different shapes, or may be the same shape but different sizes. In addition, the shapes of the openings of the plurality of cells provided in the reinforcing material 50 may be the same as each other or may be different from each other.
The reinforcing material 50 preferably has a plurality of cells 51 arranged such that the openings of the cells 51 are adjacent to each other when viewed from the open end. The plurality of cells 51 may be arranged such that the cells 51 are arranged without gaps between them, for example, as in the case where the shape of the opening of the cells 51 shown in (b) of fig. 4 is hexagonal, or the like, when the open end surface is viewed from above. Alternatively, the plurality of cells 51 may be arranged such that the cell partition walls 53 of the plurality of cells 51 are partially connected and arranged with gaps between the plurality of cells 51, as in the case where the shape of the opening of the cells 51 is circular or the like, when viewed from the open end surface.
As shown in fig. 4 (b), for example, the reinforcing material 50 preferably has a honeycomb structure in which the opening shape is hexagonal in both the 1 st opening end face and the 2 nd opening end face, and a plurality of cells are arranged so that the openings are adjacent to each other and the cells are arranged without gaps in the plane direction of the polarizing plate composite 41.
The size of the opening of the cell 51 of the reinforcing material 50 is not particularly limited, and preferably has a diameter smaller than that of the non-polarizing region 12. The diameter of the cells is preferably 3mm or less, and may be 2mm or less, or 1mm or less, and usually 0.1mm or more, and may be 0.5mm or more. The diameter of the opening of the cell 51 means the length on the straight line having the longest length among straight lines connecting any two points of the periphery of the opening.
The height of the cells 51 (length in the direction perpendicular to the open end faces of the cells 51) of the reinforcing material 50 is usually 0.1 μm or more, and may be 0.5 μm or more, and may be 1 μm or more, and may be 3 μm or more, and is usually 15 μm or less, and may be 13 μm or less, and may be 10 μm or less.
The cell partition walls 53 of the reinforcing material 50 partitioning the cells 51 preferably have light transmittance.
The line width of the cell partition walls 53 of the reinforcing material 50 is, for example, 0.05mm or more, and may be 0.1mm or more, and may be 0.5mm or more, and may be 1mm or more, and is usually 5mm or less, and may be 3mm or less.
The cell partition walls 53 of the reinforcing material 50 may 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 thermoplastic resins, thermosetting resins, and active energy ray-curable resinsAnd curable resins such as a curable resin. Examples of the resin material include the curable resin (X); examples of the thermoplastic resin used as the filler include thermoplastic resins. As the inorganic oxide, silicon oxide (SiO) may be mentioned2) Alumina, and the like.
In the case where the reinforcing materials 50 are provided on both sides of the polarizing plate 10, the 2 reinforcing materials 50 may be the same as each other (the shape and size of the cells 51 are the same) or may be different from each other. The openings of the cells 51 of the 2 reinforcing materials 50 provided on both sides of the polarizing plate 10 may be arranged so as to overlap each other in a plan view, but are preferably arranged so as to be shifted from each other in a plan view.
(method for producing polarizing plate Complex)
The polarizing plate complex 41 shown in fig. 4 (a) can be produced by forming a reinforcing material 50 on the polarizing plate 10. The reinforcing material 50 can be obtained by forming cell partition walls 53 that partition the cells 51 on the surface of the polarizing plate 10 using a resin material or an inorganic oxide, for example.
The method of forming the cell walls 53 using a resin material is not particularly limited, and examples thereof include printing methods such as inkjet printing, screen printing, and gravure printing; photoetching; coating methods using a nozzle, a die, or the like. In the above method, a resin composition obtained by mixing a resin material with a solvent, an additive, and the like can be used. Examples of the additives include leveling agents, antioxidants, plasticizers, tackifiers, organic or inorganic fillers, pigments, antioxidants, ultraviolet absorbers, and antioxidants. The cell partition walls 53 may be formed by curing or treating for curing the printed or coated resin composition as necessary.
The method for forming the cell walls 53 using an inorganic oxide is not particularly limited, and may be formed by, for example, evaporating an inorganic oxide.
When the reinforcing material 50 of the polarizing plate complex 41 has a filler, the filler may be filled in the space inside the cells 51 and the gap between the cells 51 in the reinforcing material 50 formed in the polarizing plate 10. The material constituting the filler may be filled by coating the reinforcing material 50, for example. Alternatively, when an adhesive is used as a material constituting the filler, an adhesive sheet provided with an adhesive layer may be bonded to a release film and filled with the adhesive.
< optical laminate >
Fig. 5 to 8 are schematic cross-sectional views schematically showing an example of the optical laminate of the present embodiment. The optical laminate has a protective layer on one side or both sides of the polarizing plate 10 shown in fig. 1 (b) to (d) and the polarizing plate composite 41 shown in fig. 4 (a).
(optical layered body (1))
The optical laminate 42 shown in fig. 5 (a) to (c) includes the polarizing plate 10 shown in any one of fig. 1 (b) to (d), and the protective layer 17 provided on one surface side of the polarizing plate 10. The protective layer 17 is a cured product layer of the curable resin (X) provided directly on the polarizing plate 10. The curable resin (X) constituting the protective layer 17 which is a cured product layer is not particularly limited as long as it is a resin cured by irradiation with active energy rays such as ultraviolet rays, visible light, electron beams, and X-rays, and examples thereof include the curable resin (X) described above. The protective layer 17 is preferably a cured product layer of a curable resin composition containing the same curable resin (X) as the curable resin (X) constituting the cured product contained in the non-polarizing region 12 of the polarizing plate 10.
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 polarizing plate 10, the protective layer 17 preferably covers at least the non-polarizing region 12 of the polarizing plate 10. The protective layer 17 may cover at least a part of one surface of the polarizing plate 10, and preferably covers the entire surface of one surface of the polarizing plate 10.
In order to produce the optical laminate 42, for example, a curable resin composition is applied to one surface of the polarizing plate 10, and the curable resin (X) contained in the curable resin composition is cured by irradiation with active energy rays. In this way, the protective layer 17, which is a cured product layer of the curable resin (X), can be formed on the polarizing plate 10 to obtain the optical laminate 42.
Alternatively, a curable resin composition is first applied to the surface of the apertured polarizing plate 21 of the 2 nd laminate 33 (fig. 3 (d)), whereby the through-holes 22 of the apertured polarizing plate 21 are filled with the curable resin composition, and a coating layer of the curable resin composition is also formed on the surface of the apertured polarizing plate 21. Then, the curable resin (X) contained in the curable resin composition in and on the through-hole 22 of the apertured polarizing plate 21 is cured by irradiation with active energy rays, and a cured product and the protective layer 17 as a cured product layer are formed to obtain the optical laminate 42. In this case, the cured product contained in the unpolarized region 12 may be integrated with the cured product layer constituting the protective layer 17, and the curable resin (X) constituting the protective layer 17 may be the same as the curable resin (X) constituting the cured product contained in the unpolarized region 12.
In order to manufacture the optical laminate 42 shown in fig. 5 (b) and (c), in the case where the protective layer 17 as a cured product layer is provided on the polarizing plate 10 shown in fig. 1 (c) and (d), the protective layer 17 may be provided so as to fill the difference in thickness between the polarizing region 11 and the non-polarizing region 12 of the polarizing plate 10. Specifically, in the case of obtaining the optical laminate 42 shown in fig. 5 b, the protective layer 17 may be provided by applying the curable resin (X) so as to cover the surface of the polarizing region 11 while eliminating the difference in thickness on the side (upper surface side of fig. 1 c) of the non-polarizing region 12 smaller than the thickness of the polarizing region 11 in the polarizing plate 10 shown in fig. 1 c. In the case of obtaining the optical laminate 42 shown in fig. 5c, the protective layer 17 may be provided by applying a curable resin composition so as to cover both surfaces of the polarizing region 11 and the non-polarizing region 12 by eliminating the thickness difference on the side of the polarizing plate 10 shown in fig. 1 d where the non-polarizing region 12 protrudes from the surface of the polarizing region 11 (the upper surface side of fig. 1 d). In the optical laminate 42 shown in fig. 5 (c), the protective layer 17 is also provided on the surface of the non-polarizing region 12, but the protective layer 17 may be provided so as to cover only the surface of the polarizing region 11 without covering the surface of the non-polarizing region 12.
In the case of applying the curable resin composition, the base material film may be provided so as to cover the surface of the coating layer formed by the application. 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 polarizing plate 10. The substrate film may be peeled off after curing of the curable resin (X).
(optical layered body (2))
Fig. 6 is a schematic cross-sectional view schematically showing another example of the optical laminate of the present embodiment. The optical laminate 43 shown in fig. 6 includes: an optical laminate 42 (fig. 5 (a)) having a protective layer 17 of a cured product layer of a curable resin (X) on one surface of a polarizing plate 10, and a reinforcing material 50 provided on the polarizing plate 10 side of the optical laminate 42. The reinforcing material 50 may be provided on the protective layer 17 side of the optical layered body 42 shown in fig. 5 (a).
The reinforcing material 50 is as described above for the polarizing plate composite 41. The optical laminate 43 shown in fig. 6 can be obtained by forming the reinforcing material 50 on the optical laminate 42 shown in fig. 5 (a) by the above-described method, for example. Alternatively, the optical laminate 43 may be obtained by forming the reinforcing material 50 on the polarizing plate 10 shown in fig. 1 (b) to (d) by the above-described method and then forming the protective layer 17 by the above-described method.
(optical layered body (3))
The optical laminate 44 shown in fig. 7 has protective layers 17 and 18 on both sides of the polarizing plate 10 shown in fig. 1 (b). The optical stack 44 may have the protective layer 17 (or 18) only on one side of the polarizing plate 10. The polarizing plate 10 included in the optical laminate 44 may be the polarizing plate 10 shown in fig. 1 (c) or (d). The protective layers 17 and 18 may be provided on the polarizer 10 via a bonding layer such as an adhesive layer or an adhesive layer. In this case, for example, a film-like protective layer may be laminated on the polarizing plate 10 via a laminating layer. The protective layers 17 and 18 may be provided so as to be in direct contact with the polarizer 10 without interposing a bonding layer therebetween. In this case, the protective layers 17 and 18 can be formed, for example, by applying a composition containing a resin material constituting the protective layers 17 and 18 to the polarizing plate 10 and curing or hardening the applied layer. One of the protective layers 17 and 18 may be a protective layer provided with 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 layered body 44 may be the same as or different from each other.
In the case where the optical laminate 44 is a laminate in which the protective layers 17 and 18 are provided on the polarizing plate 10 shown in fig. 1 (c) or (d) via the adhesive layer, the adhesive layer is preferably provided so as to fill the thickness difference between the polarizing region 11 and the non-polarizing region 12 of the polarizing plate 10, and the protective layers 17 and 18 are provided. When the protective layers 17 and 18 are provided in the optical laminate 44 so as to be in direct contact with the polarizing plate 10 shown in fig. 1 (c) or (d), it is preferable to provide a composition containing a resin material constituting the protective layers 17 and 18 so as to fill the thickness difference between the polarizing region 11 and the non-polarizing region 12 of the polarizing plate 10, and to form the protective layers 17 and 18.
(optical layered body (4))
The optical laminate 45 shown in fig. 8 has protective layers 17 and 18 on both sides of the polarizing plate composite 41 shown in fig. 4 (a). The optical laminate 45 may have the protective layer 17 (or 18) only on one side of the polarizing plate complex 41. The protective layers 17 and 18 may be provided on the polarizer composite 41 via a pressure-sensitive adhesive layer such as an adhesive layer or an adhesive layer. In this case, for example, a film-like protective layer may be laminated on the polarizing plate composite 41 via a lamination layer. The protective layer 18 provided on the reinforcing material 50 side of the polarizer composite 41 may be formed by laminating a protective layer such that, for example, the inner space of the cells 51 of the reinforcing material 50 and the gaps between the plurality of cells 51 are filled with the adhesive layer. Alternatively, the protective layer may be formed by laminating a laminate sheet in which a coating layer to be a material of the adhesive layer is formed on one surface of the film-shaped protective layer on the reinforcing material 50, and filling the material to be the adhesive layer into the spaces inside the cells 51 of the reinforcing material 50 and the gaps between the plurality of cells 51. In fig. 8, although the case where the reinforcing material is provided on one surface of the polarizing plate 10 is shown, the reinforcing material 50 may be provided on both surfaces of the polarizing plate 10.
The protective layers 17 and 18 may be provided so as to be in direct contact with the polarizer composite 41 without interposing a bonding layer therebetween. The protective layer 17 provided on the polarizing plate 10 side of the polarizing plate composite 41 may be formed, for example, by applying a composition containing a resin material constituting the protective layer 17 to the polarizing plate 10 of the polarizing plate composite 41 and curing or hardening the applied layer. The protective layer 18 provided on the reinforcing material 50 side of the polarizer composite 41 may be formed by providing a composition containing a resin material constituting the protective layer 18 so as to fill the internal space of the cells 51 of the reinforcing material 50, the gaps between the plurality of cells 51, and the like, and filling the protective layer 18.
One of the protective layers 17 and 18 may be a protective layer provided with 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 layered body 44 may be the same as or different from each other.
(protective layer)
The protective layers 17 and 18 are preferably resin layers capable of transmitting light, and may be resin films or coating layers formed by coating a composition containing a resin material. The resin used in the resin layer is preferably a thermoplastic resin having excellent transparency, mechanical strength, thermal stability, moisture barrier properties, isotropy, stretchability, and the like. Examples of the thermoplastic resin include those constituting a base film that can be used for producing the raw material polarizing plate 20. When the optical layered bodies 42 to 45 have the protective layers 17 and 18 on both surfaces, the resin compositions of the protective layers 17 and 18 may be the same or different from each other.
From the viewpoint of thinning, 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, and may be 80 μm or less, or may be 60 μm or less. The thickness of the protective layers 17, 18 is usually 5 μm or more, and may be 10 μm or more, or 20 μm or more. The protective layers 17 and 18 may or may not have a phase difference. When the optical layered bodies 42 to 45 have the protective layers 17 and 18 on both surfaces, the thicknesses of the protective layers 17 and 18 may be the same or different from each other.
(laminating layer)
The adhesive layer is an adhesive layer or an adhesive layer. Examples of the binder for forming the binder layer and the binder for forming the adhesive layer include binders and adhesives for constituting the filler.
< laminate having adhesive layer for optical display element >
The polarizing plate 10 shown in fig. 1 (b) to (d), the polarizing plate composite 41 shown in fig. 4 (a), and the optical layered bodies 42 to 45 shown in fig. 5 to 8 may further include a bonding layer for an optical display element to be bonded to an optical display element (a liquid crystal panel, an organic EL element) of a display device such as a liquid crystal display device or an organic EL display device.
In the polarizing plate 10, the polarizing plate composite 41, and the optical laminates 42 to 45, when the adhesive layer for an optical display element is provided on the surface where the difference in thickness occurs between the polarizing region 11 and the non-polarizing region 12 as in the polarizing plate 10 shown in fig. 1 (c) or (d), the adhesive layer for an optical display element is preferably provided so as to fill the difference in thickness.
In the case where the optical display element adhesive layer is provided on the surface of the reinforcing material 50 in the polarizing plate composite 41 and the optical layered bodies 43 and 45, the filling of the filling material into the inner space of the cells 51 of the reinforcing material 50 and the formation of the optical display element adhesive layer can be performed simultaneously by using the material constituting the optical display element adhesive layer as the filling material provided in the reinforcing material 50.
Description of the reference numerals
10: polarizing plate, 11: polarization region, 11 m: 1 st plane, 11 n: plane 2, 12: non-polarizing region, 17, 18: protective layer, 20: raw material polarizing plate, 21: apertured polarizer, 22: through-hole, 25: support layer 1, 26: support layer 2, 31: 1 st stacked body, 32: through-hole, 33: laminate 2, 41: polarizing plate complex, 42 to 45: optical laminate, 50: reinforcing material, 51: cells, 53: cell walls.
Claims (14)
1. A polarizing plate having a polarizing region and a non-polarizing region surrounded by the polarizing region in a plan view,
the thickness of the polarization region is 15 μm or less,
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.
2. The polarizing plate according to claim 1, wherein a thickness of the cured product is the same as a thickness of the polarizing region.
3. The polarizing plate according to claim 1, wherein a thickness of the cured product is smaller than a thickness of the polarizing region.
4. The polarizing plate according to claim 1, wherein a thickness of the cured product is larger than a thickness of the polarizing region.
5. The polarizing plate according to any one of claims 1 to 4, wherein the non-polarizing region has light transmittance.
6. The polarizing plate according to any one of claims 1 to 5, wherein a diameter of the non-polarizing region in a plan view is 0.5mm or more and 20mm or less.
7. The polarizing plate according to any one of claims 1 to 6, wherein the active energy ray-curable resin comprises an epoxy compound.
8. The polarizing plate according to claim 7, wherein the epoxy compound comprises an alicyclic epoxy compound.
9. A polarizing plate composite comprising the polarizing plate according to any one of claims 1 to 8 and a reinforcing material provided on at least one surface side of the polarizing plate,
the reinforcing material has a plurality of cells arranged in such a manner that each open end face is opposed to a face of the polarizing plate.
10. The polarizer composite according to claim 9, wherein the opening of the cell has a polygonal, circular or elliptical shape.
11. The polarizing plate composite according to claim 9 or 10, wherein a light-transmitting filler is further provided in an inner space of the cell.
12. An optical laminate comprising a polarizing plate according to any one of claims 1 to 8 or a polarizing plate composite according to any one of claims 9 to 11 and a protective layer on at least one surface side.
13. The optical laminate according to claim 12, wherein the protective layer is a cured product layer of an active energy ray-curable resin provided on the polarizing plate.
14. The optical laminate according to claim 13, wherein the active energy ray-curable resin constituting the protective layer is the same active energy ray-curable resin as that constituting the cured product contained in the polarizing region.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2019-194275 | 2019-10-25 | ||
| JP2019194275A JP7456747B2 (en) | 2019-10-25 | 2019-10-25 | optical laminate |
| PCT/JP2020/032325 WO2021079612A1 (en) | 2019-10-25 | 2020-08-27 | Polarizer, polarizer composite, and optical laminate |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN114616496A true CN114616496A (en) | 2022-06-10 |
Family
ID=75620463
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202080074340.2A Pending CN114616496A (en) | 2019-10-25 | 2020-08-27 | Polarizing plate, polarizing plate composite, and optical laminate |
Country Status (5)
| Country | Link |
|---|---|
| JP (2) | JP7456747B2 (en) |
| KR (1) | KR20220086575A (en) |
| CN (1) | CN114616496A (en) |
| TW (1) | TW202116545A (en) |
| WO (1) | WO2021079612A1 (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20170176657A1 (en) * | 2013-11-08 | 2017-06-22 | Apple Inc. | Electronic Device Display With Polarizer Windows |
| JP2018128664A (en) * | 2017-02-10 | 2018-08-16 | 日東電工株式会社 | Polarizing film, image display device, and manufacturing method of the polarizing film |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP6214594B2 (en) | 2014-04-25 | 2017-10-18 | 日東電工株式会社 | Polarizer, polarizing plate and image display device |
-
2019
- 2019-10-25 JP JP2019194275A patent/JP7456747B2/en active Active
-
2020
- 2020-08-27 CN CN202080074340.2A patent/CN114616496A/en active Pending
- 2020-08-27 WO PCT/JP2020/032325 patent/WO2021079612A1/en active Application Filing
- 2020-08-27 KR KR1020227013221A patent/KR20220086575A/en unknown
- 2020-09-07 TW TW109130588A patent/TW202116545A/en unknown
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2024
- 2024-02-05 JP JP2024015819A patent/JP2024036510A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20170176657A1 (en) * | 2013-11-08 | 2017-06-22 | Apple Inc. | Electronic Device Display With Polarizer Windows |
| JP2018128664A (en) * | 2017-02-10 | 2018-08-16 | 日東電工株式会社 | Polarizing film, image display device, and manufacturing method of the polarizing film |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2024036510A (en) | 2024-03-15 |
| JP7456747B2 (en) | 2024-03-27 |
| WO2021079612A1 (en) | 2021-04-29 |
| KR20220086575A (en) | 2022-06-23 |
| JP2021067866A (en) | 2021-04-30 |
| TW202116545A (en) | 2021-05-01 |
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