JP2018159911A - Polarizing plate and image display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a polarizing plate that can reduce cracks in a polarizer caused by a change in temperature.SOLUTION: A polarizing plate (1A) comprises: a film-like polarizer (7); and a resin layer (9) containing a resin cured product. The resin layer (9) is overlapped on the polarizer (7) and closely adhered to the polarizer (7); a concave notch part (7C) is formed in an end (7e) of the polarizer (7) or a hole (21) penetrating the polarizer (7) is formed.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a polarizing plate and an image display device.

  The polarizing plate is one of optical components that constitute an image display device such as a liquid crystal television, an organic EL television, or a smartphone. The polarizing plate includes a film-like polarizer and an optical film (for example, a protective film) that overlaps the polarizer. Since most of general image display devices have a quadrangular screen, the conventional polarizing plate mounted on the image display device is also quadrangular, and the whole has a uniform polarizing ability. On the other hand, special image display devices have irregular shapes depending on their use or design reasons, and conventional polarizing plates mounted on the devices are also irregular. For example, Patent Document 1 below describes forming a cut-out portion at the end of a polarizer as a liquid crystal injection port. Alternatively, an image display device used for a smart watch or a vehicle-mounted meter may have to be formed with a hole through which the rotating shaft of the pointer passes. Therefore, it is necessary to form a through hole in the polarizing plate mounted on the image display device. Since the use and purpose of the polarizing plate are various, various cases where notches or through holes must be formed in the polarizing plate are assumed depending on the use and purpose.

JP 2000-155325 A

  The polarizer expands or contracts as the temperature changes. As a result of the study by the present inventors, it has been found that a crack of the polarizer is formed in the notch or the through hole due to the contraction of the polarizer accompanying the temperature change. In particular, cracks are likely to be formed due to thermal shock (rapid temperature change).

  This invention is made | formed in view of the said situation, and it aims at providing the polarizing plate which can suppress the crack of the polarizer resulting from a temperature change, and the image display apparatus containing the said polarizing plate. .

  A polarizing plate according to one aspect of the present invention includes a film-like polarizer and a resin layer containing a cured resin, and the resin layer overlaps the polarizer and is in close contact with the polarizer. A notch is formed at the end of the polarizer.

  A polarizing plate according to another aspect of the present invention includes a film-like polarizer and a resin layer containing a cured resin, and the resin layer overlaps the polarizer and is in close contact with the polarizer. A hole is formed through the polarizer.

  The polarizing plate according to the above aspect of the present invention may further include an adhesive layer, and the adhesive layer may overlap the resin layer and be in close contact with the resin layer.

  In the above aspect of the present invention, the cured resin may include an epoxy compound.

  In the above aspect of the present invention, the cured resin may contain an oxetane compound.

  In the above aspect of the present invention, the cured resin may include a (meth) acrylic compound.

  In the above aspect of the present invention, the resin layer may be an overcoat layer.

  An image display device according to one aspect of the present invention includes the polarizing plate.

  ADVANTAGE OF THE INVENTION According to this invention, the polarizing plate which can suppress the crack of the polarizer resulting from a temperature change, and the image display apparatus containing the said polarizing plate are provided.

It is a typical perspective view of the polarizing plate which concerns on 1st embodiment of this invention. It is a top view of the polarizer with which the polarizing plate shown by FIG. 1 is provided. It is a schematic diagram of the cross section of the image display apparatus (liquid crystal display device) which concerns on 1st embodiment of this invention. (A) in FIG. 4 is a top view of the polarizer included in the modification of the first embodiment of the present invention, and (b) in FIG. 4 is included in the modification of the first embodiment of the present invention. FIG. 4C is a top view of the polarizer, FIG. 4C is a top view of the polarizer included in the modification of the first embodiment of the present invention, and FIG. It is a top view of the polarizer with which the modification of one Embodiment is provided. It is a top view of the polarizer with which the example of the present invention is provided. It is a typical perspective view of the polarizing plate which concerns on 2nd embodiment of this invention.

  Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings. In the drawings, the same components are denoted by the same reference numerals. The present invention is not limited to the following embodiment. X, Y, and Z shown in each figure mean three coordinate axes orthogonal to each other. The direction indicated by each coordinate axis is common to all drawings.

[First embodiment]
Based on FIG.1 and FIG.2, 1st embodiment of this invention is described. A polarizing plate 1A according to the first embodiment includes a film-like polarizer 7, a resin layer 9, and a plurality of optical films (3, 5, 13). All of the polarizer 7, the resin layer 9, and the optical films (3, 5, 13) are quadrangular. The “optical film” means a film-like member (excluding the polarizer itself) constituting the polarizing plate. The optical film may be rephrased as a layer or an optical layer. The optical film implies, for example, a protective film and a release film. In the first embodiment, the plurality of optical films (3, 5, 13) are the first protective film 5, the second protective film 3, and the release film 13 (separator). That is, the polarizing plate 1 </ b> A includes the polarizer 7, the first protective film 5, the resin layer 9, the second protective film 3, and the release film 13. The polarizing plate 1 </ b> A also includes an adhesive layer 11 positioned between the resin layer 9 and the release film 13.

  The resin layer 9 overlaps the entire surface of the polarizer 7 and is in close contact with the entire surface of the polarizer 7. The adhesive layer 11 overlaps the entire surface of the resin layer 9 and is firmly adhered to the entire surface of the resin layer 9. The release film 13 covers the entire surface of the adhesive layer 11. The first protective film 5 overlaps the entire other surface of the polarizer 7 and is adhered to the entire other surface of the polarizer 7. The second protective film 3 covers the entire surface of the first protective film 5.

  The resin layer 9 includes a cured resin. The resin layer 9 may consist only of a resin cured product. The resin layer 9 is a layer formed by curing a curable resin composition (curable resin composition). Since the resin layer 9 has a three-dimensional crosslinked structure, the resin layer 9 is harder than a resin film such as an optical film (3, 5, 13). The resin layer 9 is distinguished from a resin film such as an optical film (3, 5, 13) based on a cross-linked structure or a difference in monomer composition or molecular structure.

  A concave cut-out portion (C) 7C (concave cut-out portion) is formed at the end portion (first end portion 7e) of the polarizer 7. The notch 7C is formed in the polarizer 7, the resin layer 9, the optical film (3, 5, 13) and the adhesive layer 11 in the stacking direction (Z-axis direction). 5, 13) and the adhesive layer 11 are all penetrated. That is, a concave notch common to all of the polarizer 7, the resin layer 9, the optical films (3, 5, 13) and the adhesive layer 11 constituting the polarizing plate 1 A is formed on the end face of the polarizing plate 1 A. ing. The shape of the notch 7C of the polarizer 7 viewed from the stacking direction (Z-axis direction) may be the same as or similar to the shape of the notch of the polarizing plate 1A viewed from the stacking direction. The shape of the notch of the polarizing plate 1A viewed from the stacking direction may be regarded as the shape of the notch 7C of the polarizer 7 viewed from the stacking direction. Hereinafter, not only the notch portion 7C of the polarizer 7 but also the notch portion of the polarizing plate 1A including the notch portion 7C may be referred to as “notch portion 7C”. The notch 7C is, for example, a rectangle.

  As will be described below, the polarizer 7 is easily split along the absorption axis of the polarizer 7. That is, the crack of the polarizer 7 is easily formed along the absorption axis of the polarizer 7. Here, the absorption axis may be rephrased as, for example, a straight line substantially parallel to the orientation direction of polyvinyl alcohol (PVA) molecules in the polarizer 7. The absorption axis may be rephrased as, for example, a straight line substantially parallel to the orientation direction of a dye molecule (for example, polyiodine or organic dye) adsorbed on polyvinyl alcohol in the polarizer 7. It can be said that many carbon atoms constituting one PVA molecule are bonded to each other by a covalent bond (CC bond) along the absorption axis. On the other hand, in a direction substantially perpendicular to the absorption axis, PVA molecules are bonded by a cross-linking bond via a cross-linking agent (for example, boric acid). In other words, in the direction substantially perpendicular to the absorption axis, the hydroxy group of each PVA molecule forms a hydrogen bond or an oxygen-boron bond (OB bond) with boric acid located between the PVA molecules. The PVA molecules are cross-linked. CC bonds formed along the absorption axis are stronger than cross-linked bonds formed along a direction substantially perpendicular to the absorption axis. Therefore, the mechanical strength of the polarizer 7 in the direction substantially parallel to the absorption axis is higher than the mechanical strength of the polarizer 7 in the direction substantially perpendicular to the absorption axis. In other words, the thermal contraction of the polarizer 7 in a direction substantially parallel to the absorption axis is less likely to cause cracks than the thermal contraction of the polarizer 7 in a direction substantially perpendicular to the absorption axis. On the other hand, in the direction perpendicular to the absorption axis, weak crosslinks are formed as compared to CC bonds in the PVA molecule. Therefore, thermal contraction of the polarizer 7 in a direction substantially perpendicular to the absorption axis is more likely to cause cracks than thermal contraction of the polarizer 7 in a direction substantially parallel to the absorption axis. The mechanical strength anisotropy in the polarizer 7 as described above tends to cause a crack in the polarizer 7 in the notch 7C. Since the orientation of the end face of the polarizer 7 exposed at the notch 7C is not constant and uniform with respect to the absorption axis of the polarizer 7, the notch 7C when the polarizer 7 contracts with a temperature change. Does not shrink uniformly. As a result, stress is likely to occur locally at the end face of the polarizer 7 exposed at the notch 7C. Due to this stress, a crack starting from the notch 7 </ b> C is likely to be formed along the absorption axis of the polarizer 7. For example, when the deep part (back part) of the notch 7C contracts in a direction substantially perpendicular to the absorption axis, cracks are likely to be formed along the absorption axis in the deep part of the notch 7C. Moreover, the crack of the polarizer 7 in the notch portion 7C is also caused by processing for forming the notch portion 7C. Unlike the case where the linear end portion of the polarizing plate 1A is formed, in the process of forming the concave notch portion 7C at the end portion of the polarizing plate 1A, a load is applied to the laminate constituting the polarizing plate 1A, particularly the polarizer 7. It is easy to start. Due to this processing load, minute scratches are likely to enter the end of the polarizer 7 exposed at the notch 7C. This minute scratch is likely to be a starting point of a crack when the polarizer 7 is thermally contracted.

  However, in the first embodiment, as described below, since the resin layer 9 is in close contact with the polarizer 7, cracks of the polarizer 7 at the notch 7 </ b> C due to temperature change are suppressed. Even if stress is generated in the polarizer 7 that contracts with a change in temperature, the resin layer 9 that is in close contact with the polarizer 7 is hard and difficult to break, and therefore cracking of the polarizer 7 that is in close contact with the resin layer 9 is also suppressed. As described above, the mechanism by which the crack of the polarizer 7 is suppressed by the resin layer 9 is related to the hardness and thermal behavior of the resin layer 9. According to such a mechanism, the crack of the polarizer 7 in the notch 7C is suppressed without being influenced by the positional relationship between the position, orientation, and shape of the notch 7C and the absorption axis of the polarizer 7. . However, the mechanism by which the crack of the polarizer 7 is suppressed by the resin layer 9 has not yet been elucidated. The reason why cracks of the polarizer 7 are suppressed is not limited to the above. In addition, since the polarizing plate 1A includes the resin layer 9, light leakage (white spots) and thermal spots in the polarizing plate 1A (particularly around the notch 7C) are suppressed.

The resin layer 9 may be an overcoat layer. The overcoat layer may be rephrased as a layer formed by curing an uncured curable resin composition that covers the surface of the polarizer 7. For example, an uncured curable resin is directly applied to the surface of the polarizer 7 to form a layer containing an uncured curable resin (an uncured layer), and the uncured layer is cured to form the resin layer 9. You may get. Alternatively, by forming an uncured layer on the surface of the base film, transferring the uncured layer from the base film to the surface of the polarizer 7, and curing the uncured layer transferred to the surface of the polarizer 7. The resin layer 9 may be obtained. When the uncured layer is brought into close contact with the surface of the polarizer 7, the relatively soft uncured layer can easily bite into the fine irregularities on the surface of the polarizer 7 without gaps, and the resin layer 9 obtained by curing the uncured layer is also polarized. It is easy to bite into the fine irregularities on the surface of the child 7 without a gap. As a result, an anchor effect occurs, and the anchor effect may easily suppress cracks in the polarizer 7 in the notch 7C.
The rate of increase in absorbance of the resin layer 9 may be 0% or more and 30% or less. The rate of increase in absorbance is defined by the following mathematical formula (A).
Absorbance increase rate (%) = {(Absf−Absi) / Absi} × 100 (A)
“Absf” is the absorbance at 360 nm of the resin layer 9 after the immersion treatment. The immersion treatment means that the resin layer 9 is immersed in a 50% aqueous solution of potassium iodide for 100 hours in the atmosphere at a temperature of 23 ° C. and a relative humidity of 60%. Before the absorbance measurement, the surface of the resin layer 9 after the immersion treatment is washed with pure water, and the pure water is wiped off from the surface of the resin layer 9. “Absi” is the absorbance at 360 nm of the resin layer 9 before the immersion treatment.
The resin layer 9 is less likely to absorb iodine (dichroic dye) as the absorbance increase rate of the resin layer 9 is lower. When the rate of increase in absorbance of the resin layer 9 is 30% or less, the movement of iodine (dichroic dye) contained in the polarizer 7 to the resin layer 9 is effectively suppressed, and the other is caused by iodine (dichroic dye). Corrosion of the layer (for example, a conductive layer such as an ITO layer) is suppressed. Moreover, when the rate of increase in absorbance of the resin layer 9 is 30% or less, the optical performance of the polarizing plate 1A is easily maintained.
It is preferable that the absorbance increase rate of the resin layer 9 is as low as possible. The rate of increase in absorbance of the resin layer 9 may be 0% to 25%, 0% to 20%, 0% to 15%, 0% to 10%, or 0% to 3%. As the absorbance increase rate of the resin layer 9 is lower, the movement of iodine (dichroic dye) contained in the polarizer 7 to the resin layer 9 is more easily suppressed as described above, and corrosion of other layers (for example, conductive layers) is suppressed. Is easily suppressed, and deterioration of the optical performance of the polarizing plate 1A is easily suppressed.
The photoelastic coefficient of the resin layer 9 may be 0 or more and less than 10 ⁻¹² (less than the measurement limit), or 0 or more and 10 ⁻¹³ or less. As the photoelastic coefficient of the resin layer 9 is smaller and smaller than the photoelastic coefficient of another optical film (for example, a protective film), light leakage (white spots) and thermal spots in the polarizing plate 1A are more easily suppressed. The photoelastic coefficient may be measured by a phase difference measuring device (elliptical polarization measuring device). As the phase difference measuring device, “KOBRA-WPR” manufactured by Oji Scientific Instruments may be used. In the measurement of the photoelastic coefficient, the dimension of the resin layer 9 is adjusted to 2 cm × 10 cm. Then, the center retardation value (23 ° C./wavelength 590 nm) of the resin layer 9 is measured while sandwiching both ends of the resin layer 9 and applying a stress of 5 to 15 N to the resin layer 9. A photoelastic coefficient is calculated from the slope of the function of the stress and the phase difference value.

  The width Wc of the cutout portion 7C in the direction parallel to the end portion (first end portion 7e) of the polarizer 7 may be, for example, 2 mm or more and less than 600 mm, or 5 mm or more and 30 mm or less. The width W of the entire polarizer 7 in the direction parallel to the end portion (first end portion 7e) where the notch portion 7C is formed may be, for example, 30 mm or more and 600 mm or less. The width Wc of the notch 7C may be less than the width W of the entire polarizer 7, for example. When the width Wc of the notch 7C is 5 mm or more and 30 mm or less, the width W of the entire polarizer 7 (width of the entire polarizing plate 1A) is greater than 20 mm and 160 mm or less, preferably greater than 25 mm and 130 mm or less, more preferably It may be greater than 30 mm and not greater than 100 mm, more preferably greater than 30 mm and not greater than 80 mm (Wc <W). The ratio Wc / W between the width Wc of the notch 7C and the width W of the entire polarizer 7 is 0.03 or more and less than 1.0, 0.10 or more and less than 1.0, or 0.13 or more and less than 1.0. , Preferably 0.15 or more and less than 1.0, or 0.17 or more and less than 1.0, more preferably 0.20 or more and less than 1.0, or 0.22 or more and less than 1.0, and further preferably 0.30. It may be more than 1.0 and less than 0.33 or less than 1.0. Wc / W may be rephrased as the ratio of the width Wc of the notch 7C to the width W of the entire polarizing plate 1A. When the ratio Wc / W is in the above range, cracks at the notch 7C are easily suppressed. The reason is as follows. As the width Wc of the notch portion 7C is smaller than the entire width W of the polarizer 7, a force for expanding the width Wc of the notch portion 7C is more likely to occur due to contraction of the entire polarizer 7 due to temperature change. Cracks are likely to occur in 7C. In other words, the smaller Wc / W, the easier it is for cracks to occur in the notch 7C. On the other hand, as Wc / W is larger (the width W of the entire polarizer 7 is smaller), the contraction amount of the entire polarizer 7 due to the temperature change is reduced. That is, the absolute value of the amount of change in the overall width W of the polarizer 7 is reduced as the overall width W of the polarizer 7 is smaller. Due to the reduction in the amount of shrinkage of the entire polarizer 7 due to the temperature change, it is difficult to generate a force for expanding the width Wc of the notch 7C, and cracks in the notch 7C are easily suppressed. However, even when Wc / W is outside the above numerical range, it is possible to suppress cracks in the cutout portion 7C.

  The length Dc of the notch 7C in the direction perpendicular to the end (first end 7e) may be, for example, 1 mm or more and 30 mm or less. The length Dc may be rephrased as the depth of the notch 7C in the direction perpendicular to the end (first end 7e). The length D of the entire polarizer 7 in the direction perpendicular to the end portion (first end portion 7e) may be, for example, 30 mm or more and 600 mm or less. The thickness of the polarizing plate 1A may be, for example, 10 μm to 1200 μm, 10 μm to 500 μm, 10 μm to 300 μm, or 10 μm to 200 μm.

The manufacturing method of the polarizing plate 1A includes at least a bonding step and a processing step. In the bonding step, the resin layer 9 is formed on the surface of the long strip-shaped polarizer film. In the bonding step, a polarizer film and a plurality of long strip-shaped optical films are bonded together to produce a laminate (first laminate). The long strip-shaped polarizer film is the polarizer 7 before processing and molding. The long strip-like optical films are optical films (3, 5, 13) before processing and molding. In the subsequent processing step, the first laminate is processed to produce a plurality of laminates (second laminates) having desired dimensions and shapes. In the processing step, for example, the second laminate may be produced by cutting the first laminate with a blade. In the processing step, for example, the second laminate may be produced by punching the first laminate. In the processing step, for example, the second laminate may be produced by cutting the first laminate with a laser. The laser may be, for example, a CO ₂ laser or an excimer laser. In the processing step, for example, the second laminate may be manufactured by combining cutting using the above-described blade, punching, and cutting using a laser. The first laminated body is processed by the above-described processing method, and after adjusting the dimension of the first laminated body to be larger than a predetermined dimension, the end of the first laminated body is cut and polished with a milling cutter. May be produced.

  In the processing step, the concave notch portion 7C may be formed in the first end portion 7e of the second laminate by, for example, punching processing or cutting using a blade or a laser. After producing the 2nd laminated body in which the notch part 7C was formed in the process step, you may perform an edge part process step. In the end portion processing step, for example, the end surface of the second laminated body including the notch portion 7C may be cut and polished using an end mill. An end mill is a kind of milling cutter. The end mill cuts and polishes the end surface of the second laminate including the notch portion 7C, for example, with a blade located on a side surface substantially parallel to the rotation axis. As a result, the end surface of the second laminate including the notch 7C is finished smoothly. By using this end mill, the second laminate can be formed into a polarizing plate 1A having a desired shape and dimensions in a short time. That is, the productivity of the polarizing plate 1A is improved. In the processing step, the first laminate may be punched larger than before to produce a second laminate, and in the subsequent end portion processing step, the end face of the second laminate may be cut and polished with an end mill. As a result, the margin of the edge part removed from the second laminate in the end part processing step is reduced, and the generation of foreign matters such as polishing debris in the end part processing step is suppressed. ) Is suppressed.

  The notch portion 7C may not be formed in the processing step, and the concave notch portion 7C may be formed in the first end portion 7e of the second stacked body in the end portion processing step subsequent to the processing step. In the end portion processing step, for example, the notched portion 7C may be formed in the second stacked body by irradiating the end portion of the second stacked body with the laser and cutting a part or all of the end portion. . The notch 7C may be formed in the second laminate by the end machining step using the above-described end mill.

  The cured resin that forms the resin layer 9 may be formed from a photocurable resin composition that is cured by irradiation with active energy rays. The cured resin that forms the resin layer 9 may be formed from a thermosetting resin composition that is cured by heating. The cured resin that forms the resin layer 9 may include an epoxy compound. The cured resin that forms the resin layer 9 may include an oxetane compound. The cured resin that forms the resin layer 9 may include a (meth) acrylic compound. Below, the specific example of the curable resin composition suitable for formation of the resin layer 9 (resin hardened | cured material) is demonstrated in detail.

<Curable resin composition for resin layer 9>
The curable resin composition used for forming the resin layer 9 preferably contains an epoxy compound having at least one epoxy group in the molecule as the active energy ray-curable compound. By using such a curable resin composition containing an epoxy compound, the resin layer 9 exhibits good adhesion to the polarizer 7, and also has transparency, mechanical strength, thermal stability, and moisture barrier properties. Thus, it is possible to obtain a polarizing plate 1A having excellent durability performance. The “epoxy compound having at least one epoxy group in the molecule” means a compound having one or more epoxy groups in the molecule and capable of being cured by irradiation with active energy rays. This epoxy compound preferably has at least two epoxy groups in the molecule. “Active energy ray-curable compound” is a generic term for curable resin compositions that can be cured by irradiation with active energy rays, including epoxy compounds, oxetane compounds and (meth) acrylic compounds described later. Meaning.

(Active energy ray-curable compound 1: Cationic polymerizable compound)
Examples of the epoxy compound constituting the curable resin composition include a glycidyl ether of a polyol having an alicyclic ring, an alicyclic epoxy compound, an aliphatic epoxy compound, and an aromatic epoxy compound.

  The glycidyl ether of a polyol having an alicyclic ring is a compound obtained by glycidyl etherifying a hydroxyl group of a compound having at least two hydroxyl groups bonded to the alicyclic ring in the molecule. A polyol having an alicyclic ring, that is, a compound having at least two hydroxyl groups bonded to the alicyclic ring in the molecule is selectively hydrogenated to the aromatic ring under pressure in the presence of a catalyst. It can be obtained by performing. Aromatic polyols include, for example, bisphenol type compounds such as bisphenol A, bisphenol F and bisphenol S; novolac type resins such as phenol novolac resin, cresol novolac resin and hydroxybenzaldehyde phenol novolac resin; tetrahydroxydiphenylmethane, tetrahydroxybenzophenone And polyfunctional compounds such as polyvinylphenol. Glycidyl ether can be obtained by reacting an alicyclic polyol obtained by hydrogenating the aromatic ring of these aromatic polyols with epichlorohydrin. Among these, hydrogenated bisphenol A diglycidyl ether is preferable.

  An alicyclic epoxy compound is a compound having at least one epoxy group bonded to an alicyclic ring in the molecule. The “epoxy group bonded to the alicyclic ring” means a bridging oxygen atom —O— in the structure represented by the following chemical formula 1, wherein m is an integer of 2 to 5.

A compound in which one or a plurality of hydrogen atoms in (CH ₂ ) _m in the above chemical formula 1 are bonded to another chemical structure can be an alicyclic epoxy compound. One or more hydrogen atoms in (CH ₂ ) _m forming the alicyclic ring 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 epoxycyclopentane ring (m = 3 in the above formula) or an epoxycyclohexane ring (m = 4 in the above formula) are cured products. Is more preferably used because of its high elastic modulus and excellent adhesion to the polarizer 7.

  Specific examples of the alicyclic epoxy compound are listed below. In the following, compound names are given first, followed by chemical formulas corresponding to the respective compound names. A compound name and a chemical formula corresponding to the compound name are denoted by the same reference numerals.

A: 3,4-epoxycyclohexylmethyl 3,4-epoxycyclohexanecarboxylate,
B: 3,4-epoxy-6-methylcyclohexylmethyl 3,4-epoxy-6-methylcyclohexanecarboxylate,
C: ethylene bis (3,4-epoxycyclohexanecarboxylate),
D: Bis (3,4-epoxycyclohexylmethyl) adipate,
E: bis (3,4-epoxy-6-methylcyclohexylmethyl) adipate,
F: Diethylene glycol bis (3,4-epoxycyclohexyl methyl ether),
G: ethylene glycol bis (3,4-epoxycyclohexyl methyl ether),
H: 2,3,14,15-diepoxy-7,11,18,21-tetraoxatrispiro [5.2.2.5.2.2] henicosane,
I: 3- (3,4-epoxycyclohexyl) -8,9-epoxy-1,5-dioxaspiro [5.5] undecane,
J: 4-vinylcyclohexene dioxide,
K: Limonene dioxide
L: bis (2,3-epoxycyclopentyl) ether,
M: Dicyclopentadiene dioxide and the like.

The aliphatic epoxy-based compound can be an aliphatic polyhydric alcohol or a polyglycidyl ether of an alkylene oxide adduct thereof. Aliphatic epoxy compounds include, for example, 1,4-butanediol diglycidyl ether, 1,6-hexanediol diglycidyl ether, glycerin triglycidyl ether, trimethylolpropane triglycidyl ether, polyethylene glycol diglycidyl. Ether, diglycidyl ether of propylene glycol, polyglycidyl ether of polyether polyol obtained by adding alkylene oxide (ethylene oxide or propylene oxide) to aliphatic polyhydric alcohol such as ethylene glycol, propylene glycol and glycerin .
From the viewpoint of improving the adhesiveness between the polarizer 7 and the pressure-sensitive adhesive layer 11, the aliphatic epoxy compound contained in the curable resin composition has two oxirane rings bonded to aliphatic carbon atoms in the molecule. It is preferable that it is a functional epoxy compound (aliphatic diepoxy compound). When the curable resin composition contains an aliphatic diepoxy compound, a curable resin composition having a low viscosity and easy to apply can be obtained.

An aromatic epoxy compound is a compound having one or more aromatic rings in the molecule. Specific examples of the aromatic epoxy compound are listed below.
Monohydric phenol having at least one aromatic ring such as phenol, cresol, butylphenol or the like, or mono / polyglycidyl etherified product of an alkylene oxide adduct thereof, such as bisphenol A, bisphenol F, or a compound obtained by further adding an alkylene oxide thereto Glycidyl etherified products and epoxy novolac resins;
A glycidyl ether of an aromatic compound having two or more phenolic hydroxyl groups such as resorcinol, hydroquinone, catechol;
Mono / polyglycidyl etherified products of aromatic compounds having two or more alcoholic hydroxyl groups such as benzenedimethanol, benzenediethanol, benzenedibutanol;
Glycidyl esters of polybasic aromatic compounds having two or more carboxylic acids such as phthalic acid, terephthalic acid, trimellitic acid;
Glycidyl esters of benzoic acids such as benzoic acid, toluic acid, naphthoic acid;
Epoxidized styrene oxide or divinylbenzene.

  From the viewpoint of lowering the viscosity of the curable composition, the aromatic epoxy compound includes a glycidyl ether of a phenol, a glycidyl ether of an aromatic compound having two or more alcoholic hydroxyl groups, a glycidyl ether of a polyhydric phenol, benzoic acid It is preferable to include at least one selected from the group consisting of glycidyl esters of acids, glycidyl esters of polybasic acids, styrene oxide or epoxidized divinylbenzene. Moreover, since it improves the sclerosis | hardenability of a curable composition, as an aromatic epoxy compound, what has an epoxy equivalent of 80-500 is preferable. One kind of aromatic epoxy compound may be used alone, or a plurality of different kinds of aromatic epoxy compounds may be used in combination.

A commercially available product can be used as the aromatic epoxy compound. The commercial names of aromatic epoxy compounds are, for example, Denacol EX-121, Denacol EX-141, Denacol EX-142, Denacol EX-145, Denacol EX-146, Denacol EX-147, Denacol EX-201, Denacol EX-203, Denacol EX-711, Denacol EX-721, On-coat EX-1020, On-coat EX-1030, On-coat EX-1040, On-coat EX-1050, On-coat EX-1051, On-coat EX-1010, ONCOAT EX-1011, ONCOAT 1012 (manufactured by Nagase ChemteX Corporation); OGSOL PG-100, OGSOL EG-200, OGSOL EG-210, OGSOL EG-250 (manufactured by Osaka Gas Chemical Co.); HP4032, HP 032D, HP4700 (manufactured by DIC Corporation); ESN-475V (manufactured by Nippon Steel & Sumikin Chemical Co., Ltd.); Epicoat YX8800 (manufactured by Mitsubishi Chemical Corporation); Marproof G-0105SA, Marproof G-0130SP (manufactured by NOF Corporation); N-665, Epicron HP-7200 (above, manufactured by DIC); EOCN-1020, EOCN-102S, EOCN-103S, EOCN-104S, XD-1000, NC-3000, EPPN-501H, EPPN-501HY, EPPN- 502H, NC-7000L (above, manufactured by Nippon Kayaku Co., Ltd.); Adekaglycilol ED-501, Adekaglycilol ED-502, Adekaglycilol ED-509, Adekaglycilol ED-529, Adekaresin EP-4000, Adeka Resin EP -4005, a Karejin EP-4100, Adecaresin EP-4901 (manufactured by ADEKA Corporation); TECHMORE VG-3101L, EPOX-MKR710, EPOX-MKR151 (manufactured by pudding-Tech Co., Ltd.), and the like.
When the curable resin composition contains an aromatic epoxy compound, the curable resin composition becomes a hydrophobic resin, and the cured product layer (resin layer 9) obtained thereby can also have hydrophobicity. As a result, entry of moisture from the outside into the polarizing plate 1A is suppressed under high temperature and high humidity, and the movement of the dichroic dye (iodine) contained in the polarizer 7 is effectively suppressed.

  In the curable resin composition, the epoxy compounds may be used alone or in combination of two or more. Since the resin layer 9 excellent in adhesiveness with respect to the polarizer 7 is obtained, the curable resin composition preferably includes at least an alicyclic epoxy compound.

  The content of the epoxy compound may be 30 to 100% by weight, preferably 35 to 70% by weight, more preferably 40 to 60% by weight, based on the total amount of the active energy ray-curable compound. When the content of the epoxy compound is less than 30% by weight, the adhesion with the polarizer 7 tends to be lowered.

  Moreover, in addition to said epoxy type compound, you may mix | blend an oxetane type compound with curable resin composition. By adding an oxetane compound, the viscosity of the curable resin composition can be lowered and the curing rate can be increased. Furthermore, the effect which prevents yellowing of a cured film and improves optical durability is also anticipated.

The oxetane compound is a compound having a 4-membered ring ether in the molecule. Examples of the oxetane compound include 3-ethyl-3-hydroxymethyloxetane, 1,4-bis [(3-ethyl3-oxetanyl) methoxymethyl] benzene, 3-ethyl-3- (phenoxymethyl) oxetane, bis ( 3-ethyl-3-oxetanylmethyl) ether, 3-ethyl-3- (2-ethylhexyloxymethyl) oxetane, phenol novolac oxetane and the like. Commercial products of these oxetane compounds can be easily obtained. For example, the trade names of oxetane compounds sold by Toagosei are “Aron Oxetane OXT-101”, “Aron Oxetane OXT-121”, “Aron Oxetane OXT-211”, “Aron Oxetane OXT-221”. "Aron Oxetane OXT-212". The blending amount of the oxetane compound is not particularly limited, but may be 70% by weight or less, preferably 10 to 50% by weight, based on the total amount of the active energy ray-curable compound.
The composition of the curable resin composition is 100% by mass of the total amount of polymerizable compounds (the entire curable resin composition).
(A1) 35 to 70% by mass of an oxetane compound having two or more oxetanyl groups,
(A2) 0 to 40% by mass of an aliphatic epoxy compound having two or more epoxy groups,
(A3) 15 to 50% by mass of an alicyclic epoxy compound having two or more epoxy groups, and (A4) 0 to 20% by mass of an aromatic epoxy compound having one or more aromatic rings
It is preferable that
When the curable resin composition contains the oxetane compound (A) and the alicyclic epoxy compound (B1), the content of the alicyclic epoxy compound (B1) with respect to the content (WA) of the oxetane compound (A) ( The mass ratio (WB1 / WA) of WB1) is preferably 0.05 to 1.5.
When the curable resin composition contains an oxetane compound (A) and an aliphatic epoxy compound (B2), the content (WB2) of the aliphatic epoxy compound (B2) with respect to the content (WA) of the oxetane compound (A). The mass ratio (WB2 / WA) is preferably 0.1 to 0.5.
When the curable resin composition contains an oxetane compound (A) and an aromatic epoxy compound (B3), the content (WB3) of the aromatic epoxy compound (B3) with respect to the content (WA) of the oxetane compound (A). The mass ratio (WB3 / WA) is preferably 0.1 to 1.5.

(Polymerization initiator 1: Photocationic polymerization initiator)
When the curable resin composition contains a cationically polymerizable compound such as an epoxy compound or an oxetane compound, it is preferable to add a photocationic polymerization initiator to the curable resin composition. By using the cationic photopolymerization initiator, the resin layer 9 can be formed at room temperature. Therefore, the heat resistance of the polarizer 7 and the distortion due to expansion are reduced, and the resin layer 9 is added to the polarizer 7. Is easy to adhere. Moreover, since a photocationic polymerization initiator acts catalytically by light, it is excellent in storage stability and workability even when mixed with a curable resin composition.

  The cationic photopolymerization initiator generates a cationic species or a Lewis acid upon irradiation with active energy rays such as visible light, ultraviolet light, X-rays, and electron beams, and initiates a polymerization reaction of an epoxy compound and / or an oxetane compound. It is something to be made. From the viewpoint of workability, it is preferable that the cationic photopolymerization initiator is provided with latency. Examples of the cationic photopolymerization initiator include aromatic diazonium salts; onium salts such as aromatic iodonium salts and aromatic sulfonium salts; and iron-arene complexes.

Specific examples of the aromatic diazonium salt are as follows.
Benzenediazonium hexafluoroantimonate,
Benzenediazonium hexafluorophosphate,
Benzenediazonium hexafluoroborate, etc.

Specific examples of the aromatic iodonium salt are as follows.
Diphenyliodonium tetrakis (pentafluorophenyl) borate,
Diphenyliodonium hexafluorophosphate,
Diphenyliodonium hexafluoroantimonate,
Bis (4-nonylphenyl) iodonium hexafluorophosphate and the like.

Specific examples of the aromatic sulfonium salt are as follows.
Triphenylsulfonium hexafluorophosphate,
Triphenylsulfonium hexafluoroantimonate,
Triphenylsulfonium tetrakis (pentafluorophenyl) borate,
4,4′-bis (diphenylsulfonio) diphenyl sulfide bishexafluorophosphate,
4,4′-bis [di (β-hydroxyethoxy) phenylsulfonio] diphenyl sulfide bishexafluoroantimonate,
4,4′-bis [di (β-hydroxyethoxy) phenylsulfonio] diphenyl sulfide bishexafluorophosphate,
7- [di (p-toluyl) sulfonio] -2-isopropylthioxanthone hexafluoroantimonate,
7- [di (p-toluyl) sulfonio] -2-isopropylthioxanthone tetrakis (pentafluorophenyl) borate,
4-phenylcarbonyl-4′-diphenylsulfoniodiphenyl sulfide hexafluorophosphate,
4- (p-tert-butylphenylcarbonyl) -4′-diphenylsulfoniodiphenyl sulfide hexafluoroantimonate,
4- (p-tert-butylphenylcarbonyl) -4′-di (p-toluyl) sulfoniodiphenyl sulfide tetrakis (pentafluorophenyl) borate and the like.

Moreover, as an iron-arene complex, the following compounds are mentioned, for example.
Xylene-cyclopentadienyl iron (II) hexafluoroantimonate,
Cumene-cyclopentadienyl iron (II) hexafluorophosphate,
Xylene-cyclopentadienyl iron (II) tris (trifluoromethylsulfonyl) methanide and the like.

  Commercial products of these photocationic polymerization initiators can be easily obtained. The commercial names of the photocationic polymerization initiators are “Kayarad PCI-220” and “Kayarad PCI-620” (manufactured by Nippon Kayaku Co., Ltd.), “Adekaoptomer SP-150” and “Adekaopt”. "Mer SP-170" (manufactured by ADEKA Corporation), "UVACURE 1590" (manufactured by Daicel Cytec Corporation), "CI-5102", "CIT-1370", "CIT-1682", "CIP-" 1866S "," CIP-2048S "and" CIP-2064S "(manufactured by Nippon Soda Co., Ltd.)," DPI-101 "," DPI-102 "," DPI-103 "," DPI-105 "," “MPI-103”, “MPI-105”, “BBI-101”, “BBI-102”, “BBI-103”, “BBI-105”, “TPS-10” "," TPS-102 "," TPS-103 "," TPS-105 "," MDS-103 "," MDS-105 "," DTS-102 "and" DTS-103 "[Midori Chemical Co., Ltd. )], “UVI-6990” (manufactured by Union Carbide), “PI-2074” (manufactured by Rhodia), and the like.

  These photocationic polymerization initiators may be used alone or in combination of two or more. Among these, aromatic sulfonium salts, in particular, have ultraviolet absorption characteristics even in a wavelength region of 300 nm or more, and therefore, cured products having excellent curability, good mechanical strength, and good adhesion to the polarizer 7. Since it can be given, it is preferably used.

  The compounding amount of the cationic photopolymerization initiator is 0.5 to 20 parts by weight, preferably 10 parts by weight or less, more preferably 100 parts by weight of the total of the cationically polymerizable compounds including the epoxy compound and the oxetane compound. It may be 1-6 parts by weight. If the amount of the cationic photopolymerization initiator is small, curing becomes insufficient, and the mechanical strength and the adhesion between the resin layer 9 and the polarizer 7 tend to be reduced. On the other hand, when there are too many compounding quantities of a photocationic polymerization initiator, the ionic substance in hardened | cured material will increase, the hygroscopic property of hardened | cured material will become high, and durability performance may fall.

(Active energy ray-curable compound 2: Radical polymerizable compound)
The curable resin composition used in the present invention contains a radical polymerizable compound that can be polymerized by irradiation with active energy rays in the presence of a polymerization initiator in addition to the above-described cationic polymerizable compound such as an epoxy compound. May be. Moreover, a curable resin composition can also be comprised only with a radically polymerizable compound as an active energy ray curable compound. As the radical polymerizable compound, a (meth) acrylic compound having at least one (meth) acryloyloxy group in the molecule is preferably used. The (meth) acrylic compound means that either an acrylic acid ester or a methacrylic acid ester may be used, and in the present specification, (meth) acryloyl, (meth) acrylate, (meth) acrylic acid, etc. “(Meta)” at the time has the same purpose.

  A (meth) acrylic compound having at least one (meth) acryloyloxy group in the molecule is a (meth) acrylate monomer having at least one (meth) acryloyloxy group in the molecule or a compound having a functional group. It includes a (meth) acrylate oligomer obtained by reacting more than one species and having at least two (meth) acryloyloxy groups in the molecule. These monomers and oligomers will be specifically described below, but these monomers can be used alone or in combination of two or more as desired. The combination of two or more types includes a combination of monomers and a combination of oligomers, and also includes a combination of one or more monomers and one or more oligomers.

  The (meth) acrylate monomer includes a monofunctional (meth) acrylate monomer having one (meth) acryloyloxy group in the molecule, a bifunctional (meth) acrylate monomer having two (meth) acryloyloxy groups in the molecule, And a polyfunctional (meth) acrylate monomer having three or more (meth) acryloyloxy groups in the molecule.

Specific examples of the monofunctional (meth) acrylate monomer are as follows.
Tetrahydrofurfuryl (meth) acrylate,
2-hydroxyethyl (meth) acrylate,
2- or 3-hydroxypropyl (meth) acrylate,
2-hydroxybutyl (meth) acrylate,
2-hydroxy-3-phenoxypropyl (meth) acrylate,
Isobutyl (meth) acrylate,
tert-butyl (meth) acrylate,
2-ethylhexyl (meth) acrylate,
Cyclohexyl (meth) acrylate,
Dicyclopentenyl (meth) acrylate,
Benzyl (meth) acrylate,
Isobornyl (meth) acrylate,
2-phenoxyethyl (meth) acrylate,
Dicyclopentenyloxyethyl (meth) acrylate,
N, N-dimethyl-2-aminoethyl (meth) acrylate,
Ethyl carbitol (meth) acrylate,
Trimethylolpropane mono (meth) acrylate,
Pentaerythritol mono (meth) acrylate,
Phenoxy polyethylene glycol (meth) acrylate etc.

A compound having a carboxyl group in the molecule together with one (meth) acryloyloxy group can also be a monofunctional (meth) acrylate monomer. Specific examples of the monofunctional (meth) acrylate monomer having a carboxyl group are as follows.
2- (meth) acryloyloxyethylphthalic acid,
2- (meth) acryloyloxyethyl hexahydrophthalic acid,
2-carboxyethyl (meth) acrylate,
2- (meth) acryloyloxyethyl succinic acid,
4- (meth) acryloyloxyethyl trimellitic acid and the like.

  There are various bifunctional (meth) acrylate monomers. Typical bifunctional (meth) acrylate monomers include alkylene glycol di (meth) acrylates, polyoxyalkylene glycol di (meth) acrylates, halogen-substituted alkylene glycol di (meth) acrylates, di (meta) of aliphatic polyols. ) Diacrylates of acrylates, hydrogenated dicyclopentadiene or tricyclodecane dialkanol, di (meth) acrylates, di (meth) acrylates of dioxane glycol or dioxane dialkanol, di (meth) acrylate adducts of bisphenol A or bisphenol F Meth) acrylates, bisphenol A or bisphenol F epoxy di (meth) acrylates, and the like.

Specific examples of the bifunctional (meth) acrylate monomer are as follows.
Ethylene glycol di (meth) acrylate,
1,3-butanediol di (meth) acrylate,
1,4-butanediol di (meth) acrylate,
1,6-hexanediol di (meth) acrylate,
1,9-nonanediol di (meth) acrylate,
Neopentyl glycol di (meth) acrylate,
Trimethylolpropane di (meth) acrylate,
Pentaerythritol di (meth) acrylate,
Ditrimethylolpropane di (meth) acrylate,
Diethylene glycol di (meth) acrylate,
Triethylene glycol di (meth) acrylate,
Dipropylene glycol di (meth) acrylate,
Tripropylene glycol di (meth) acrylate,
Polyethylene glycol di (meth) acrylate,
Polypropylene glycol di (meth) acrylate,
Polytetramethylene glycol di (meth) acrylate,
Di (meth) acrylate of hydroxypivalic acid neopentyl glycol ester,
2,2-bis [4- {2- (2- (meth) acryloyloxyethoxy) ethoxy} phenyl] propane,
2,2-bis [4- {2- (2- (meth) acryloyloxyethoxy) ethoxy} cyclohexyl] propane,
Hydrogenated dicyclopentadienyl di (meth) acrylate,
Tricyclodecane dimethanol di (meth) acrylate,
1,3-dioxane-2,5-diyl di (meth) acrylate [alias: dioxane glycol di (meth) acrylate],
Di (meta) of acetal compound [chemical name: 2- (2-hydroxy-1,1-dimethylethyl) -5-ethyl-5-hydroxymethyl-1,3-dioxane] of hydroxypivalaldehyde and trimethylolpropane ) Acrylate,
1,3,5-tris (2-hydroxyethyl) isocyanurate di (meth) acrylate and the like.

There are various polyfunctional (meth) acrylate monomers having three or more functions. For example, a poly (meth) acrylate of a trihydric or higher aliphatic polyol is representative. Specific examples thereof are as follows.
Glycerin tri (meth) acrylate,
Trimethylolpropane tri (meth) acrylate,
Ditrimethylolpropane tri (meth) acrylate,
Ditrimethylolpropane tetra (meth) acrylate,
Pentaerythritol tri (meth) acrylate,
Pentaerythritol tetra (meth) acrylate,
Dipentaerythritol tetra (meth) acrylate,
Dipentaerythritol penta (meth) acrylate,
Dipentaerythritol hexa (meth) acrylate, etc.

  In addition, poly (meth) acrylates of trivalent or higher-valent halogen-substituted polyols, tri (meth) acrylates of alkylene oxide adducts of glycerin, tri (meth) acrylates of alkylene oxide adducts of trimethylolpropane, 1,1,1 -Tris [2- {2- (meth) acryloyloxyethoxy} ethoxy] propane, 1,3,5-tris [2- (meth) acryloyloxyethyl] isocyanurate can also be a polyfunctional (meth) acrylate monomer .

  On the other hand, the (meth) acrylate oligomer is, for example, a urethane (meth) acrylate oligomer, a polyester (meth) acrylate oligomer, or an epoxy (meth) acrylate oligomer.

  The urethane (meth) acrylate oligomer refers to a compound having at least two (meth) acryloyloxy groups in the molecule and a urethane bond (—NHCOO—). The urethane (meth) acrylate oligomer is, for example, a urethanation reaction product of a hydroxyl group-containing (meth) acrylate monomer having at least one (meth) acryloyloxy group and one hydroxyl group in the molecule and a polyisocyanate. It's okay. The urethane (meth) acrylate oligomer has, for example, a terminal isocyanato group-containing urethane compound obtained by reacting polyols with polyisocyanate, and at least one (meth) acryloyloxy group and one hydroxyl group in the molecule, respectively. It may be a urethanization reaction product with a hydroxyl group-containing (meth) acrylate monomer.

Specific examples of the hydroxyl group-containing (meth) acrylate monomer used for the urethanization reaction are as follows.
2-hydroxyethyl (meth) acrylate,
2-hydroxypropyl (meth) acrylate,
2-hydroxybutyl (meth) acrylate,
2-hydroxy-3-phenoxypropyl (meth) acrylate,
Glycerin di (meth) acrylate,
Trimethylolpropane di (meth) acrylate,
Pentaerythritol tri (meth) acrylate,
Dipentaerythritol penta (meth) acrylate and the like.

Specific examples of the polyisocyanate subjected to the urethanization reaction with the hydroxyl group-containing (meth) acrylate monomer are as follows.
Hexamethylene diisocyanate,
Lysine diisocyanate,
Isophorone diisocyanate,
Dicyclohexylmethane diisocyanate,
Tolylene diisocyanate,
Xylylene diisocyanate,
Compounds obtained by hydrogenating aromatic diisocyanates, such as hydrogenated tolylene diisocyanate, hydrogenated xylylene diisocyanate,
Triphenylmethane triisocyanate,
Dibenzylbenzene triisocyanate,
Polyisocyanate obtained by diversifying diisocyanates among these.

  The polyols for producing the terminal isocyanate group-containing urethane compound by reaction with polyisocyanate may be aliphatic and alicyclic polyols, polyester polyols, polyether polyols and the like. Aliphatic and alicyclic polyols include, for example, 1,4-butanediol, 1,6-hexanediol, ethylene glycol, diethylene glycol, triethylene glycol, propylene glycol, neopentyl glycol, trimethylolethane, trimethylolpropane, Examples include ditrimethylolpropane, pentaerythritol, dipentaerythritol, dimethylolheptane, dimethylolpropionic acid, dimethylolbutyric acid, glycerin, and hydrogenated bisphenol A.

  The polyester polyol is a compound obtained by subjecting the above-described polyols to a dehydration condensation reaction of a polybasic carboxylic acid or an anhydride thereof. Specific examples of the polybasic carboxylic acid and its anhydride are (anhydrous) succinic acid, adipic acid, (anhydrous) maleic acid, (anhydrous) itaconic acid, (anhydrous) trimellitic acid, (anhydrous) pyromellitic acid, hexahydro (Anhydrous) phthalic acid, (anhydrous) phthalic acid, isophthalic acid, terephthalic acid and the like. The polybasic carboxylic acid may not be an anhydride.

  The polyether polyol may be a polyalkylene glycol, or may be a polyoxyalkylene-modified polyol obtained by reacting an alkylene oxide with the aforementioned polyols or bisphenols.

  The polyester (meth) acrylate oligomer refers to a compound having at least two (meth) acryloyloxy groups in the molecule and an ester bond. A polyester (meth) acrylate oligomer can be obtained by dehydration condensation reaction of (meth) acrylic acid, polybasic carboxylic acid or anhydride thereof, and polyol. Specific examples of the polybasic carboxylic acid or its anhydride used in the dehydration condensation reaction are (anhydrous) succinic acid, adipic acid, (anhydrous) maleic acid, (anhydrous) itaconic acid, (anhydrous) trimellitic acid, (anhydrous) ) Pyromellitic acid, hexahydro (anhydrous) phthalic acid, (anhydrous) phthalic acid, isophthalic acid, terephthalic acid. It may not be an anhydride of a polybasic carboxylic acid. Specific examples of polyols used in the dehydration condensation reaction include 1,4-butanediol, 1,6-hexanediol, ethylene glycol, diethylene glycol, triethylene glycol, propylene glycol, neopentyl glycol, trimethylol ethane, and trimethylol propane. Ditrimethylolpropane, pentaerythritol, dipentaerythritol, dimethylolheptane, dimethylolpropionic acid, dimethylolbutyric acid, glycerin, hydrogenated bisphenol A, and the like.

  The epoxy (meth) acrylate oligomer is obtained by addition reaction of polyglycidyl ether and (meth) acrylic acid, and has at least two (meth) acryloyloxy groups in the molecule. Specific examples of the polyglycidyl ether used in this addition reaction include ethylene glycol diglycidyl ether, propylene glycol diglycidyl ether, tripropylene glycol diglycidyl ether, 1,6-hexanediol diglycidyl ether, bisphenol A diglycidyl ether, and the like. is there.

  Among the above (meth) acrylic compounds, since both adhesion and elastic modulus are excellent, at least one of the (meth) acrylic compounds represented by the following formulas (I) to (IV) is Particularly preferred.

In the above formulas (I) and (II), Q ₁ and Q ₂ each independently represent a (meth) acryloyloxy group or a (meth) acryloyloxyalkyl group. When Q ₁ or Q ₂ is a (meth) acryloyloxyalkyl group, the alkyl may be linear or branched and can have 1 to 10 carbon atoms, but generally about 1 to 6 carbon atoms. Carbon number is sufficient. In the formula (II), Q is hydrogen or a hydrocarbon group having 1 to 10 carbon atoms, and this hydrocarbon group may be linear or branched, and can typically be an alkyl group. In this case, it is sufficient that the alkyl group has about 1 to 6 carbon atoms.

On the other hand, in the formula (III), R ₁ , R ₂ and R ₃ independently represent a (meth) acryloyloxy group, and in the formula (IV), R represents a hydroxyl group or a (meth) acryloyloxy group. .

The compound represented by the formula (I) is a di (meth) acrylate derivative of hydrogenated dicyclopentadiene or tricyclodecane dialkanol. Specific examples of the compound represented by the formula (I) include hydrogenated dicyclopentadienyl di (meth) acrylate [in the formula (I), both Q ₁ and Q ₂ are the same (meth) acryloyloxy group. Compound], tricyclodecane dimethanol di (meth) acrylate [a compound in which both Q ₁ and Q ₂ are the same (meth) acryloyloxymethyl group in formula (I)], and the like.

The compound represented by the formula (II) is a di (meth) acrylate derivative of dioxane glycol or dioxane dialkanol. Specific examples of the compound represented by the formula (II) include 1,3-dioxane-2,5-diyl di (meth) acrylate [also known as dioxane glycol di (meth) acrylate, in the formula (II), Q ₁ And Q ₂ are the same (meth) acryloyloxy groups and Q and H are the same], an acetal compound of hydroxypivalaldehyde and trimethylolpropane [chemical name: 2- (2-hydroxy- 1,1-dimethylethyl) -5-ethyl-5-hydroxymethyl-1,3-dioxane] di (meth) acrylate [in formula (II), Q ₁ is a (meth) acryloyloxymethyl group, Q ₂ is 2- (meth) acryloyloxy-1,1-dimethylethyl group, Q is an ethyl group compound] and the like.

  The compound represented by the formula (III) is triacrylate or trimethacrylate of 1,3,5-tris (2-hydroxyethyl) isocyanurate. The compound represented by formula (IV) is pentaerythritol tri- or tetra- (meth) acrylate, and specific examples thereof are pentaerythritol tri (meth) acrylate and pentaerythritol tetra (meth) acrylate. .

  The (meth) acrylic compound is preferably used in combination with at least an epoxy compound. The content of the (meth) acrylic compound may be 70% by weight or less, preferably 35 to 70% by weight, preferably 40 to 60% by weight, based on the total amount of the active energy ray-curable compound. When the content of the (meth) acrylic compound in the active energy ray-curable compound exceeds 70% by weight, the adhesiveness with the polarizer 7 tends to decrease.

(Polymerization initiator 2: Photoradical polymerization initiator)
When the active energy ray-curable compound contains a radical polymerizable compound such as a (meth) acrylic compound, it is preferable to mix a photo radical polymerization initiator as a polymerization initiator. The radical photopolymerization initiator is not particularly limited as long as it can start curing of the radically polymerizable compound by irradiation with active energy rays, and a conventionally known one can be used. Specific examples of the photo radical polymerization initiator include acetophenone, 3-methylacetophenone, benzyldimethyl ketal, 1- (4-isopropylphenyl) -2-hydroxy-2-methylpropan-1-one, 2-methyl-1- [ Acetophenone initiators such as 4- (methylthio) phenyl] -2-morpholinopropan-1-one and 2-hydroxy-2-methyl-1-phenylpropan-1-one; benzophenone, 4-chlorobenzophenone and 4, Benzophenone initiators such as 4'-diaminobenzophenone; benzoin ether initiators such as benzoin propyl ether and benzoin ethyl ether; thioxanthone initiators such as 4-isopropylthioxanthone; other xanthones, fluorenones, camphorquinones, Be Such as nzualdehyde and anthraquinone.

  The compounding amount of the radical photopolymerization initiator is 0.5 to 20 parts by weight, preferably 10 parts by weight or less, more preferably 1 to 100 parts by weight based on 100 parts by weight of the radical polymerizable compound such as a (meth) acrylic compound. It may be 6 parts by weight. When the amount of the radical photopolymerization initiator is small, the curing becomes insufficient, and the mechanical strength and the adhesion between the resin layer 9 and the polarizer 7 tend to decrease. On the other hand, if the amount of the radical photopolymerization initiator is too large, the amount of the active energy ray-curable compound in the curable resin composition is relatively small, and the durability performance of the resin layer 9 may be reduced.

  The curable resin composition can further contain a photosensitizer as necessary. By using a photosensitizer, the reactivity of cationic polymerization and / or radical polymerization is improved, and the mechanical strength of the resin layer 9 and the adhesion between the resin layer 9 and the polarizer 7 can be improved. Examples of the photosensitizer include carbonyl compounds, organic sulfur compounds, persulfides, redox compounds, azo compounds, diazo compounds, halogen compounds, and photoreductive dyes. Photosensitizers include benzoin derivatives such as benzoin methyl ether, benzoin isopropyl ether and α, α-dimethoxy-α-phenylacetophenone; benzophenone, 2,4-dichlorobenzophenone, methyl o-benzoylbenzoate, 4,4 ′ Benzophenone derivatives such as bis (dimethylamino) benzophenone and 4,4′-bis (diethylamino) benzophenone; thioxanthone derivatives such as 2-chlorothioxanthone and 2-isopropylthioxanthone; like 2-chloroanthraquinone and 2-methylanthraquinone Anthraquinone derivatives; acridone derivatives such as N-methylacridone and N-butylacridone; others, α, α-diethoxyacetophenone, benzyl, fluorenone, xanthone, ura Nil compounds and the like. These photosensitizers may be used alone or in combination of two or more photosensitizers. Content of a photosensitizer may be 0.1-20 weight part with respect to 100 weight part of the whole active energy ray-curable compound.

(Optional component of curable resin composition)
Moreover, the curable resin composition may contain an antistatic agent for imparting antistatic performance to the polarizing plate. Examples of the antistatic agent include a cationic surfactant, an anionic surfactant, a nonionic surfactant, an ionic compound having an organic cation other than the cationic surfactant, and an ion having an organic anion other than the anionic surfactant. Conductive compounds, conductive inorganic particles, conductive polymers, and the like. The blending ratio of these antistatic agents is appropriately determined according to desired characteristics. The blending ratio of the antistatic agent may be about 0.1 to 20 parts by weight based on 100 parts by weight of the entire active energy ray-curable compound.

  In the curable resin composition, an additive usually used for a polymer material can be blended. For example, primary antioxidants such as phenols and amines, sulfur secondary antioxidants, hindered amine light stabilizers (HALS), UV absorbers such as benzophenones, benzotriazoles, and benzoates Can be mentioned.

  A leveling agent can also be mix | blended with curable resin composition. In applying this curable resin composition onto the polarizer 7 or the substrate film, if the applicability to the polarizer 7 or the substrate film is poor or the surface property of the cured product is poor, a leveling agent is used. By blending, these problems can be improved. The leveling agent may be a silicone-based leveling agent, a fluorine-based leveling agent, a polyether-based leveling agent, an acrylic acid copolymer-based leveling agent, or a titanate-based leveling agent. These leveling agents may be used alone or in combination of two or more. The blending ratio of the leveling agent is 0.01 to 1 part by weight, preferably 0.1 to 0.7 part by weight, more preferably 0.2 to 0.5 part with respect to 100 parts by weight of the active energy ray-curable compound. It may be part by weight. If the amount of the leveling agent is small, the effect of improving the paintability and surface properties is hardly exhibited. On the other hand, when there are too many the compounding quantities, the adhesiveness of the polarizer 7 and the resin layer 9 may be reduced.

  The curable resin composition may contain fine particles, for example, silica fine particles. By blending fine particles, particularly silica fine particles, the hardness and mechanical strength of the resulting resin layer 9 can be further improved. Silica fine particles can be blended in the curable resin composition as a liquid dispersed in an organic solvent, for example. When silica fine particles dispersed in an organic solvent are used, the silica concentration in the organic solvent may be, for example, about 20 to 40% by weight.

  The silica fine particles may have a reactive functional group such as a hydroxyl group, an epoxy group, a (meth) acryloyl group, or a vinyl group on the surface thereof. The particle diameter of the silica fine particles is usually 100 nm or less, preferably about 5 to 50 nm. If the particle diameter of the fine particles exceeds 100 nm, the optically transparent resin layer 9 tends to be difficult to obtain.

  The compounding ratio of the silica fine particles may be 5 to 250 parts by weight, preferably 10 to 100 parts by weight with respect to 100 parts by weight of the active energy ray-curable compound. If the amount of the fine particles is small, the effect of improving the hardness of the resin layer 9 due to the addition of the fine particles is not sufficiently exhibited. On the other hand, if the amount of the fine particles is too large, the adhesion between the polarizer 7 and the resin layer 9 may be reduced, and the dispersion stability of the fine particles in the curable resin composition may be reduced, or the curing thereof may be reduced. The viscosity of the conductive resin composition may be excessively increased.

  The curable resin composition may contain a solvent as necessary. The solvent is appropriately selected depending on the solubility of the components constituting the curable resin composition. Solvents include aliphatic hydrocarbons such as n-hexane and cyclohexane; aromatic hydrocarbons such as toluene and xylene; alcohols such as methanol, ethanol, propanol, isopropanol and butanol; acetone, methyl ethyl ketone, methyl isobutyl Ketones such as ketones and cyclohexanones; esters such as methyl acetate, ethyl acetate and butyl acetate; cellosolves such as methyl cellosolve, ethyl cellosolve and butyl cellosolve; halogenated hydrocarbons such as methylene chloride and chloroform is there. The mixing ratio of the solvent is appropriately determined from the viewpoint of adjusting the viscosity depending on the processing purpose such as film formability.

  The polarizer 7 may be a film-like polyvinyl alcohol resin (PVA film) produced by processes such as stretching, dyeing, and crosslinking. Details of the polarizer 7 are as follows.

  For example, first, a PVA film is stretched in a uniaxial direction or a biaxial direction. The dichroic ratio of the polarizer 7 stretched in the uniaxial direction tends to be high. Following stretching, the PVA film is dyed with iodine, a dichroic dye (polyiodine) or an organic dye using a dyeing solution. The staining liquid may contain boric acid, zinc sulfate, or zinc chloride. The PVA film may be washed with water before dyeing. By washing with water, dirt and an antiblocking agent are removed from the surface of the PVA film. In addition, as a result of swelling of the PVA film by washing with water, staining spots (non-uniform staining) are easily suppressed. The dyed PVA film is treated with a solution of a crosslinking agent (for example, an aqueous solution of boric acid) for crosslinking. After the treatment with the crosslinking agent, the PVA film is washed with water and subsequently dried. Through the above procedure, the polarizer 7 is obtained. The polyvinyl alcohol resin can be obtained by saponifying a polyvinyl acetate resin. The polyvinyl acetate resin is, for example, polyvinyl acetate, which is a homopolymer of vinyl acetate, or a copolymer of vinyl acetate and another monomer (for example, ethylene-vinyl acetate copolymer). Good. Other monomers that copolymerize with vinyl acetate may be unsaturated carboxylic acids, olefins, vinyl ethers, unsaturated sulfonic acids, or acrylamides with ammonium groups in addition to ethylene. The polyvinyl alcohol-based resin may be modified with aldehydes. The modified polyvinyl alcohol resin may be, for example, partially formalized polyvinyl alcohol, polyvinyl acetal, or polyvinyl butyral. The polyvinyl alcohol resin may be a polyene oriented film such as a dehydrated polyvinyl alcohol product or a dehydrochlorinated polyvinyl chloride product. Dyeing may be performed before stretching, or stretching may be performed in a dyeing solution. The length of the stretched polarizer 7 may be, for example, 3 to 7 times the length before stretching.

  The thickness of the polarizer 7 may be, for example, 50 μm or less, 30 μm or less, 15 μm or less, 10 μm or less, or 8 μm or less. As the polarizer 7 is thinner, the contraction of the polarizer 7 itself due to the temperature change is suppressed, and the change in the dimension of the polarizer 7 itself is suppressed. As a result, stress hardly acts on the polarizer 7 and cracks in the polarizer 7 are easily suppressed. Moreover, from the viewpoint of handling properties of the film (polarizer 7), the thickness of the polarizer 7 is usually 1 μm or more and may be 4 μm or more.

  The 1st protective film 5 should just be a thermoplastic resin which has translucency, and may be an optically transparent thermoplastic resin. The resin constituting the first protective film 5 is, for example, a chain polyolefin resin, a cyclic olefin polymer resin (COP resin), a cellulose ester resin, a polyester resin, a polycarbonate resin, a (meth) acrylic resin, It may be a polystyrene-based resin, or a mixture or copolymer thereof.

  The chain polyolefin resin may be, for example, a homopolymer of a chain olefin such as a polyethylene resin or a polypropylene resin. The chain polyolefin resin may be a copolymer composed of two or more chain olefins.

  The cyclic olefin polymer resin (cyclic polyolefin resin) may be, for example, a cyclic olefin ring-opening (co) polymer or a cyclic olefin addition polymer. The cyclic olefin polymer-based resin may be, for example, a copolymer of a cyclic olefin and a chain olefin (for example, a random copolymer). The chain olefin constituting the copolymer may be, for example, ethylene or propylene. The cyclic olefin polymer-based resin may be a graft polymer obtained by modifying the above polymer with an unsaturated carboxylic acid or a derivative thereof, or a hydride thereof. The cyclic olefin polymer resin may be, for example, a norbornene resin using a norbornene monomer such as norbornene or a polycyclic norbornene monomer.

  The cellulose ester resin may be, for example, cellulose triacetate (triacetyl cellulose (TAC)), cellulose diacetate, cellulose tripropionate, or cellulose dipropionate. These copolymers may be used. A cellulose ester resin in which a part of the hydroxyl group is modified with another substituent may be used.

  Polyester resins other than cellulose ester resins may be used. The polyester resin may be, for example, a polycondensate of a polyvalent carboxylic acid or derivative thereof and a polyhydric alcohol. The polyvalent carboxylic acid or derivative thereof may be a dicarboxylic acid or derivative thereof. The polyvalent carboxylic acid or derivative thereof may be, for example, terephthalic acid, isophthalic acid, dimethyl terephthalate, or dimethyl naphthalenedicarboxylate. The polyhydric alcohol may be, for example, a diol. The polyhydric alcohol may be, for example, ethylene glycol, propanediol, butanediol, neopentyl glycol, or cyclohexanedimethanol.

  The polyester-based resin may be, for example, polyethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate, polybutylene naphthalate, polytrimethylene terephthalate, polytrimethylene naphthalate, polycyclohexanedimethyl terephthalate, or polycyclohexanedimethyl naphthalate. .

  The polycarbonate-based resin is a polymer in which polymerized units (monomers) are bonded via a carbonate group. The polycarbonate resin may be a modified polycarbonate having a modified polymer skeleton, or may be a copolymerized polycarbonate.

  (Meth) acrylic resin is, for example, poly (meth) acrylic acid ester (for example, polymethyl methacrylate (PMMA)); methyl methacrylate- (meth) acrylic acid copolymer; methyl methacrylate- (meth) acrylic Acid ester copolymer; methyl methacrylate-acrylic ester- (meth) acrylic acid copolymer; (meth) methyl acrylate-styrene copolymer (for example, MS resin); methyl methacrylate and alicyclic hydrocarbon It may be a copolymer with a compound having a group (for example, methyl methacrylate-cyclohexyl methacrylate copolymer, methyl methacrylate-norbornyl copolymer (meth) acrylate).

  The first protective film 5 may contain at least one additive selected from the group consisting of a lubricant, a plasticizer, a dispersant, a heat stabilizer, an ultraviolet absorber, an infrared absorber, an antistatic agent, and an antioxidant. .

  The thickness of the first protective film 5 may be, for example, 5 μm to 90 μm, 5 μm to 80 μm, or 5 μm to 50 μm.

  The thickness of the resin layer 9 may be, for example, 0.5 μm to 20 μm, 1 μm to 10 μm, or 1 μm to 5 μm. When the thickness of the resin layer 9 is not less than the above lower limit value, the movement of the dichroic dye from the polarizer 7 to another layer (for example, the adhesive layer 11) can be effectively suppressed. When the thickness of the resin layer 9 is not more than the above upper limit value, the curable composition can be sufficiently cured.

  The first protective film 5 may be a film having an optical function, such as a retardation film or a brightness enhancement film. For example, a retardation film to which an arbitrary retardation value is given can be obtained by stretching a film made of the thermoplastic resin or forming a liquid crystal layer or the like on the film.

  The first protective film 5 may be bonded to the polarizer 7 through an adhesive layer. The adhesive layer may contain an aqueous adhesive such as polyvinyl alcohol, and may contain an active energy ray curable resin.

  The active energy ray-curable resin is a resin that cures when irradiated with active energy rays. The active energy ray may be, for example, ultraviolet light, visible light, electron beam, or X-ray. The active energy ray curable resin may be an ultraviolet curable resin.

  The active energy ray-curable resin may be a kind of resin and may include a plurality of kinds of resins. For example, the active energy ray curable resin may contain a cationic polymerizable curable compound or a radical polymerizable curable compound. The active energy ray curable resin may contain a cationic polymerization initiator or a radical polymerization initiator for initiating a curing reaction of the curable compound.

  The cationically polymerizable curable compound may be, for example, an epoxy compound (a compound having at least one epoxy group in the molecule) or an oxetane compound (a compound having at least one oxetane ring in the molecule). The radical polymerizable curable compound may be, for example, a (meth) acrylic compound (a compound having at least one (meth) acryloyloxy group in the molecule). The radical polymerizable curable compound may be a vinyl compound having a radical polymerizable double bond.

  The active energy ray curable resin may be a cationic polymerization accelerator, an ion trapping agent, an antioxidant, a chain transfer agent, a tackifier, a thermoplastic resin, a filler, a flow regulator, a plasticizer, or an antifoaming agent, if necessary. Agents, antistatic agents, leveling agents, or solvents.

  The pressure-sensitive adhesive layer 11 may include, for example, a pressure-sensitive adhesive such as an acrylic pressure-sensitive adhesive, a rubber-based pressure-sensitive adhesive, a silicone-based pressure-sensitive adhesive, or a urethane-based pressure-sensitive adhesive. The thickness of the adhesion layer 11 may be 2 μm or more and 500 μm or less, 2 μm or more and 200 μm or less, or 2 μm or more and 50 μm or less, for example.

  The resin constituting the second protective film 3 may be the same as the above-described resins listed as resins constituting the first protective film 5. The thickness of the second protective film 3 may be, for example, 5 μm or more and 200 μm or less.

  The resin constituting the release film 13 may be the same as the above-described resins listed as resins constituting the first protective film 5. The thickness of the release film 13 may be, for example, 5 μm or more and 200 μm or less.

  The image display device according to the present invention may be, for example, a liquid crystal display device or an organic EL display device. For example, as illustrated in FIG. 3, the liquid crystal display device 30 </ b> A according to the first embodiment includes a liquid crystal cell 10 and a polarizing plate 1 </ b> Aa (first polarizing plate) that overlaps one surface (first surface) of the liquid crystal cell 10. And comprising. The polarizing plate 1Aa shown in FIG. 3 is the same as the polarizing plate 1A shown in FIG. 1 except that the release film 13 and the second protective film 3 are not provided. The polarizing plate 1 </ b> Aa (first polarizing plate) is attached to the first surface of the liquid crystal cell 10 via the adhesive layer 11. The polarizing plate 1 </ b> Aa (front-side polarizing plate) overlaps the adhesive layer 11 that overlaps the first surface of the liquid crystal cell 10, the resin layer 9 that overlaps the adhesive layer 11, the polarizer 7 that overlaps the resin layer 9, and the polarizer 7. A first protective film 5. Another polarizing plate (rear polarizing plate) may be attached to the second surface of the liquid crystal cell 10. The liquid crystal cell 10, the polarizing plate 1Aa (front side polarizing plate), and another polarizing plate (rear side polarizing plate) may constitute one liquid crystal panel 20A. The liquid crystal panel 20A and the backlight (surface light source device) and other members constitute the liquid crystal display device 30A. The backlight and other members are omitted in FIG.

  As shown in FIG. 3, when the resin layer 9 is disposed between the polarizer 7 and the liquid crystal cell 10, the iodine in the polarizer 7 is prevented from chemically damaging the liquid crystal cell 10. This is because when the iodine in the polarizer 7 is deposited on the surface of the polarizer 7 on the resin layer 9 side, the movement of iodine to the liquid crystal cell 10 is suppressed by the resin layer 9.

[Second Embodiment]
Below, 2nd embodiment of this invention is described. Hereinafter, matters unique to the second embodiment (differences between the first embodiment and the second embodiment) will be described. In matters not explained below, the second embodiment is common to the first embodiment.

  In 2nd embodiment, the hole which penetrates a polarizer is formed instead of the notch part on a concave. For example, as illustrated in FIG. 6, the polarizing plate 1 </ b> B includes a film-like polarizer 7, a resin layer 9, a first protective film 5, a second protective film 3, an adhesive layer 11, and a release film 13, and a polarizing plate The plate 1B has a hole (through hole 21) penetrating the entire polarizing plate 1B. The through hole 21 is substantially perpendicular to the surface (XY plane) of the polarizing plate 1B and is substantially parallel to the stacking direction (Z-axis direction) of the polarizing plate 1B. The shape of the through hole 21 in the direction parallel to the surface of the polarizing plate 1B (XY plane direction) is, for example, a circle as shown in FIG. However, the shape of the through hole 21 is not limited. For example, the shape of the through hole 21 may be a polygon such as a quadrangle or a triangle, or may be an ellipse.

  The resin layer 9 overlaps the entire surface of the polarizer 7 and is in close contact with the entire surface of the polarizer 7. The adhesive layer 11 overlaps the entire surface of the resin layer 9 and is firmly adhered to the entire surface of the resin layer 9. The release film 13 covers the entire surface of the adhesive layer 11. The first protective film 5 overlaps the entire other surface of the polarizer 7 and is adhered to the entire other surface of the polarizer 7. The second protective film 3 covers the entire surface of the first protective film 5.

  Since the orientation of the end face of the polarizer 7 exposed inside the through hole 21 is not constant and uniform with respect to the absorption axis of the polarizer 7, the through hole 21 is contracted when the polarizer 7 contracts with a temperature change. Does not shrink uniformly. As a result, stress is likely to be generated locally on the end face of the polarizer 7 exposed inside the through hole 21. Due to this stress, a crack starting from the inside of the through hole 21 is easily formed along the absorption axis of the polarizer 7. Further, the crack of the polarizer 7 in the through hole 21 is also caused by processing for forming the through hole 21. In the process of forming the through hole 21 in the polarizing plate 1B, a load is easily applied to the laminated body that forms the polarizing plate 1B, in particular, the polarizer 7. Due to this processing load, minute scratches are likely to enter the end portion of the polarizer 7 exposed inside the through hole 21. This minute scratch is likely to be a starting point of a crack when the polarizer 7 is thermally contracted. However, since the resin layer 9 is in close contact with the polarizer 7, cracking of the polarizer 7 in the through hole 21 due to a temperature change is suppressed. The mechanism by which the crack of the polarizer 7 in the through hole 21 is suppressed is the same as the mechanism by which the crack of the polarizer 7 in the notch 7C is suppressed. Further, when the polarizing plate 1B includes the resin layer 9, light leakage (white spots) and heat spots in the polarizing plate 1B (particularly around the through hole 21) are suppressed.

  The method for forming the through hole 21 is not limited. In the above processing step, the through hole 21 may be formed in the second laminate. For example, the through hole 21 may be formed in the second laminated body by press working (punching) using a punch and a die or cutting by a drill. The through hole 21 may be formed in the second laminate by irradiating the surface of the second laminate with a laser. For example, the through-hole 21 may be formed in the second laminate by processing using a CO2 laser or the like (thermal processing) or processing using an excimer laser (ablation processing). The inner wall of the through hole 21 may be polished with an end mill.

[Other Embodiments]
As mentioned above, this invention is not limited to said 1st embodiment and 2nd embodiment.

  For example, a plurality of concave notches may be formed in the polarizer and the polarizing plate. A plurality of through holes may be formed in the polarizer and the polarizing plate. Both the concave notch and the through hole may be formed in the polarizer and the polarizing plate. The concave notch may be formed only in the polarizer. A hole penetrating only the polarizer may be formed.

  The kind of optical film which comprises a polarizing plate, the number, and the order of lamination | stacking are not limited.

  For example, the polarizer may be sandwiched between a pair of resin layers containing a cured resin. That is, the first resin layer containing the cured resin may overlap the first surface of the polarizer, and the first resin layer may be in close contact with the first surface of the polarizer, and the second resin layer containing the cured resin may be polarized. The second resin layer may be in close contact with the second surface of the polarizer.

  The resin layer containing the cured resin may overlap the first surface of the polarizer, and the resin layer may adhere to the first surface of the polarizer, the adhesive layer may overlap the second surface of the polarizer, and the adhesive layer may be polarized It may be in close contact with the second surface of the child.

  The polarizing plate 1 </ b> A or the polarizing plate 1 </ b> B may not include one or both of the second protective film 3 and the release film 13. For example, the second protective film 3 may be peeled off and removed from the polarizing plate 1A or the polarizing plate 1B in the manufacturing process of the image display device. That is, the second protective film 3 may be a temporary protective film. The release film 13 may also be peeled off from the polarizing plate 1A during the manufacturing process of the image display device.

  The release film may be arrange | positioned on both surfaces of the polarizing plate through the adhesion layer.

  The optical film included in the polarizing plate is a reflective polarizing film, a film with an antiglare function, a film with a surface antireflection function, a reflective film, a transflective film, a viewing angle compensation film, an optical compensation layer, a touch sensor layer, and an antistatic layer. Or an antifouling layer may be sufficient.

  The polarizing plate may further include a hard coat layer. For example, in the modification of the polarizing plate 1 </ b> A or the polarizing plate 1 </ b> B, the hard coat layer may be positioned between the first protective film 5 and the second protective film 3. That is, the hard coat layer may directly overlap the surface of the first protective film 5. In this case, the first protective film 5 may contain triacetyl cellulose.

  A hard-coat layer is a layer comprised from the acrylic resin film in which the fine uneven | corrugated shape was provided in the surface, for example. The hard coat layer may be formed from a coating film containing organic fine particles or inorganic fine particles, for example. You may use the method (for example, embossing method etc.) which presses this coating film on the roll which has uneven | corrugated shape. After forming a coating film that does not contain organic fine particles or inorganic fine particles, a method of pressing the coated film against a roll having an uneven shape may be used. The inorganic fine particles may be, for example, silica, colloidal silica, alumina, alumina sol, aluminosilicate, alumina-silica composite oxide, kaolin, talc, mica, calcium carbonate, calcium phosphate and the like. The organic fine particles (resin particles) may be, for example, crosslinked polyacrylic acid particles, methyl methacrylate / styrene copolymer resin particles, crosslinked polystyrene particles, crosslinked polymethyl methacrylate particles, silicone resin particles, polyimide particles, and the like. . The binder component for dispersing the inorganic fine particles or the organic fine particles may be selected from materials having high hardness (hard coat). The binder component may be, for example, an ultraviolet curable resin, a thermosetting resin, an electron beam curable resin, or the like. From the viewpoints of productivity and hardness, an ultraviolet curable resin is preferably used as the binder component. The thickness of the hard coat layer may be, for example, 2 μm to 30 μm, or 3 μm to 30 μm.

  The shape of each of the polarizing plate and the notch may be various shapes depending on the application. For example, as shown to (a) in FIG. 4, the shape of the notch part 7C may be a semicircle. As shown in FIG. 4B, the shape of the cutout portion 7C may be a triangle. The shape of the cutout portion 7C may be a polygon other than a quadrangle and a triangle. As shown in (c) of FIG. 4, the outer edges (first end portion 7 e and second end portion 17 e) of the polarizer 7 may be circular. As shown in FIG. 4D, a chamfered part 7C3 and a chamfered part 7C4 may be formed in the deep part (corner part) of the notch part 7C. The corners 7C1 and 7C2 located at both ends of the notch 7C may also be chamfered. The outer corner CR1, the outer corner CR2, the outer corner CR3, and the outer corner CR4 located at the outer edge of the polarizer 7 may also be chamfered. The chamfering can be performed, for example, by cutting and polishing the notch and the outer edge used in the end mill. The shape of each of the polarizers 7 shown in (a) in FIG. 4, (b) in FIG. 4, (c) in FIG. 4 and (d) in FIG. May be regarded as the shape of a polarizing plate comprising In other words, the notch formed in each polarizer 7 shown in (a) in FIG. 4, (b) in FIG. 4, (c) in FIG. 4 and (d) in FIG. The shape of 7C may be regarded as the shape of the notch formed in the polarizing plate including each polarizer 7. As shown in (d) of FIG. 4, since the deep portion of the cutout portion 7C is chamfered, cracks in the cutout portion 7C are easily suppressed. The chamfered portion 7C3 and the chamfered portion 7C4 shown in FIG. 4D may be rephrased as a curved deep portion (corner portion) of the cutout portion. As the curvature radius of the curved deep portion (corner portion) of the cutout portion 7C is larger, cracks in the cutout portion 7C are more easily suppressed. For example, when the curvature radius of the curved deep portion (corner portion) of the cutout portion 7C is 0.07 mm or more, cracks in the cutout portion 7C are easily suppressed. The curvature radius of the curved deep portion (corner portion) of the cutout portion 7C is, for example, 0.07 mm or more and 30 mm or less, or 0.07 mm or more and 10 mm or less, preferably 0.09 mm or more and 30 mm or less, or 0.09 mm or more and 10 mm. The following is sufficient.

  A part of the outer edge of the polarizer may be linear, and the remaining part of the outer edge of the polarizer may be curved. A part of the first end 7e of the polarizer 7 may be linear, and the remaining part of the first end 7e of the polarizer 7 may be curved. The first end portion 7e of the polarizer 7 may be composed of only one or more straight lines (one or more sides). The first end 6e of the polarizer 7 may be composed only of a curve. A part of the second end 17e of the polarizer 7 may be linear, and the remaining part of the second end 17e of the polarizer 7 may be curved. The second end portion 17e of the polarizer 7 may consist of only one or more straight lines (one or more sides). The second end portion 17e of the polarizer 7 may be composed only of a curve. Each shape of the polarizer and the polarizing plate may be a polygon other than a quadrangle. The respective shapes of the polarizer and the polarizing plate may be elliptical, for example. The shapes of the resin layer 9 and the optical films (3, 5, 13) may be substantially the same as the shape of the polarizer 7.

  Further, according to the present invention, it is also possible to suppress light leakage in the periphery of the notch 7C or the through hole 21. For example, when the polarizing plate 1A or 1B is mounted on a liquid crystal display device, the release film 13 is peeled off from the polarizing plate 1A or 1B, and the polarizing plate 1A or 1B is attached to the surface of the liquid crystal cell via the adhesive layer 11. Combined. When the liquid crystal display device is operated, the polarizer 7 is largely contracted in the absorption axis direction by heat generated in the liquid crystal display device (for example, heat caused by the backlight). If the protective film directly overlaps the surface of the polarizer 7 instead of the resin layer 9, the protective film itself is distorted due to the large thermal contraction of the polarizer 7, and a phase difference is generated. In the part where the phase difference occurs, light is lost and spots appear in the part where the phase difference occurs. Such light leakage deteriorates the quality of an image display device such as a liquid crystal display device. In particular, for the reasons described above, stress tends to concentrate around the notch 7C or the through hole 21, and light leakage tends to occur around the notch 7C or the through hole 21. Said phase difference is dependent on the thickness or photoelastic coefficient of each layer in the location where the phase difference has occurred. For example, a retardation is likely to occur with an increase in the thickness of the protective film and an increase in the photoelastic coefficient of the protective film. Therefore, by disposing a resin layer 9 (for example, a resin layer 9 having a thickness of 0.5 to 10 μm) thinner than the conventional protective film and having a small photoelastic coefficient between the polarizer 7 and the liquid crystal cell. The light omission in the periphery of the notch 7C or the through hole 21 can be suppressed. The effects as described above can be confirmed by, for example, a durability test (particularly a heat resistance test at a high temperature) using the polarizing plate 1A or 1B.

  EXAMPLES Hereinafter, although an Example demonstrates this invention still in detail, this invention is not limited to these Examples.

Example 1
A rectangular first laminate composed of a polarizer film (polarizer 7 before cutting), a resin layer 9, three optical films (3, 5, 13), and a pressure-sensitive adhesive layer 11 Produced. The first laminate includes a release film 13, an adhesive layer 11 that overlaps the entire release film 13, a resin layer 9 that overlaps the entire adhesive layer 11, a polarizer film (7) that overlaps the entire resin layer 9, and a polarizing film. The first protective film 5 that overlaps the entire child film (7) and the second protective film 3 that overlaps the entire first protective film 5 were provided. As the polarizer film (7), stretched and dyed film-like polyvinyl alcohol was used.

The resin layer 9 was produced by the following procedure. As an uncured ultraviolet curable resin, two kinds of epoxy compounds (compounds A and B below), a kind of oxetane compound (compound C below), and a photocationic polymerization initiator (compound D below) Were mixed at the following blending ratio to prepare a mixture. This mixture was applied to the surface of the PET substrate to form an uncured layer (precursor of the resin layer 9). The polarizer film (7), the first protective film 5 and the second protective film 3 were laminated in this order to form a laminate. Subsequently, the uncured layer formed on the PET substrate was bonded to the surface of the polarizer film (7) (the surface on which the first protective film 5 did not overlap). Subsequently, the uncured layer was irradiated with ultraviolet rays (UVB). The illuminance of ultraviolet light was adjusted to 400 mJ / cm ² . After UV irradiation, the PET substrate was peeled from the resin layer 9 to obtain a resin layer 9 that overlapped the entire surface of the polarizer film (7) and was firmly adhered to the entire surface of the polarizer.

<Each compound contained in uncured ultraviolet curable resin and its blend ratio>
Compound A: 3 ′, 4′-epoxycyclohexylmethyl 3,4-epoxycyclohexanecarboxylate (“Celoxide 2021P” manufactured by Daicel Corporation)
Compound A mixing ratio: 35 parts by mass Compound B: 2- [4- (2,3-epoxypropoxy) phenyl] -2- [4- [1,1-bis [4-([2,3-epoxypropoxy] ] Phenyl] ethyl] phenyl] propane ("TECHMORE VG3101L" manufactured by Printec Co., Ltd.)
Compound B mixing ratio: 15 parts by mass Compound C: Bis (3-ethyl-3-oxetanylmethyl) ether (“Aron Oxetane OXT-221” manufactured by Toagosei Co., Ltd.)
Compound C compounding ratio: 50 parts by mass Compound D: Triphenylsulfonium hexafluorophosphate compound D compounding ratio: 2.25 parts by mass

  As the first protective film 5, a triacetyl cellulose (TAC) film was used. The entire surface of the first protective film 5 facing the second protective film 3 was covered with the hard coat layer. The first protective film 5 was adhered to the polarizer film (7) through an aqueous adhesive. As the second protective film 3, a PET protective film was used. As the release film 13, a PET separator was used. The release film 13 had a thickness of 38 μm. The thickness of the adhesive layer 11 was 20 μm. The thickness of the resin layer 9 was 3 μm. The thickness of the polarizer 7 was 7 μm. The total thickness of the first protective film 5 including the hard coat layer was 32 μm. The thickness of the second protective film 3 was 58 μm. The thickness of the water-based adhesive was 50 nm.

Said 1st laminated body was cut | disconnected with the cutter, and the smaller rectangular-shaped 2nd laminated body was produced. The second laminate was adsorbed on the stage and fixed. By irradiating the outer edge of the fixed second laminate with a CO ₂ laser, a concave notch was formed on the lateral side (first end) of the second laminate. When forming the notch, the deep part (back) of the notch was chamfered. The polarizing plate of Example 1 was obtained through the above process. The output of the CO ₂ laser was set to 20W. The oscillation wavelength of the CO ₂ laser was 10.4 μm.

The shape of the obtained polarizing plate was the same as the shape of the polarizer 7 shown in FIG. That is, the polarizer 7 shown in FIG. 5 is a polarizer included in the polarizing plate manufactured by the above procedure. The deep part (back) of the notch part 7C formed in the first end part 7e of the polarizer 7 (the lateral side of the second laminate) was a semicircle. The curvature radius R of the deep part of the notch 7C was 2 mm. 2 times the width W _C is the curvature radius R of the cutout portion 7C in the direction parallel to the first end portion 7e, was That 4 mm. The depth _{D C} of the cutout portion 7C in a direction perpendicular to the first end 7e was 10 mm. The width W of the entire first end portion 7e of the polarizer 7 in which the notch portion 7C was formed was 60 mm. That is, the length of the lateral side of the polarizing plate (lateral width of the polarizing plate) was 60 mm. The length D (vertical width of the polarizing plate) of the vertical side of the polarizing plate was 70 mm.

The release film 13 was peeled off from the adhesive layer 11 of the polarizing plate, and the polarizing plate was bonded to the glass plate via the adhesive layer 11. Furthermore, the 2nd protective film 3 was peeled from the polarizing plate. By such a procedure, a sample comprising a glass plate and a polarizing plate bonded to the glass plate was prepared. A heat cycle test was conducted using this sample. In the heat cycle test, a cycle consisting of the following step 1 and step 2 following step 1 was repeated.
Step 1: heating the sample in an atmosphere at 85 ° C. for 30 minutes.
Step 2: Cool the sample in an atmosphere of −40 ° C. for 30 minutes.

At each time point when the above cycle was repeated a predetermined number of times shown in Table 1 below, the cutout portion 7C formed in the polarizer 7 included in the sample was observed with an optical microscope.
<Measurement of absorbance increase rate of resin layer 9>
A coating film was formed by applying the above-mentioned uncured ultraviolet curable resin to one side of a cycloolefin film with a bar coater. As the cycloolefin film, “ZEONOR” manufactured by Nippon Zeon Co., Ltd. was used. The thickness of the cycloolefin film was 50 μm. Another cycloolefin film was bonded to the coating film to produce a laminate. By irradiating the surface of the laminate (that is, the surface of the cycloolefin film) with ultraviolet rays, the coating film sandwiched between the pair of cycloolefin films was cured to form a resin layer 9 ′. The composition of the resin layer 9 ′ was the same as the composition of the resin layer 9 described above. The cumulative amount of ultraviolet light in the range of 280 nm to 320 nm was 1000 mJ / cm ² . An ultraviolet irradiation device with a belt conveyor was used for ultraviolet irradiation. As an ultraviolet light source (lamp), a “D bulb” manufactured by Fusion UV Systems was used. The cycloolefin film was peeled from both surfaces of the resin layer 9 ′. The thickness of the resin layer 9 ′ was about 30 μm. The absorbances Absi and Absf of the resin layer 9 ′ were measured. For the measurement of Absi and Absf, an ultraviolet-visible spectrophotometer (UV2450) manufactured by Shimadzu Corporation was used. From the Absi and Absf, the absorbance increase rate of the resin layer 9 ′ was calculated. The rate of increase in absorbance of the resin layer 9 ′ was 3%.
<Measurement of degree of polarization>
The polarizing plate of Example 1 was cut and the size of the polarizing plate was adjusted to 30 mm × 30 mm. Subsequently, the release film 13 was peeled off from the adhesive layer 11 of the polarizing plate. And the polarizing plate was bonded to the glass plate through the adhesion layer 11. Furthermore, the 2nd protective film 3 was peeled from the polarizing plate. As the glass plate, non-alkali glass “EAGLE XG” manufactured by Corning was used. The sample produced by the above procedure was subjected to autoclave treatment at a temperature of 50 ° C. and a pressure of 5 kg / cm ² (490.3 kPa). After autoclaving for 1 hour, the sample was allowed to stand for 24 hours in an environment at a temperature of 23 ° C. and a relative humidity of 55%. Subsequently, an optional accessory “film holder with polarizing film” was set in the UV-visible spectrophotometer. As the UV-visible spectrophotometer, “UV2450” manufactured by Shimadzu Corporation was used. Using this ultraviolet-visible spectrophotometer, the transmission spectrum in the transmission axis direction of the polarizing plate in the wavelength range of 380 to 700 nm was measured. Similarly, the transmission spectrum in the absorption axis direction of the polarizing plate was measured. Based on these transmission spectra, the initial polarization degree Pyi (unit:%) of the polarizing plate was determined. Subsequently, the sample was allowed to stand for 24 hours in an environment of 80 ° C. and a relative humidity of 90%. Finally, the polarization degree Pyf (unit:%) at the end of the polarizing plate was determined by the same method as Pyi. The change in polarization degree ΔPy (that is, Pyf−Pyi) of Example 1 was −0.03.

(Comparative Example 1)
In Comparative Example 1, the resin layer 9 was not formed. In the comparative example 1, instead of the resin layer 9, the 3rd protective film was adhere | attached on the polarizer film (7) through the water-system adhesive agent. As the third protective film, a film composed of a cyclic olefin polymer resin (COP resin) was used. The thickness of the water-based adhesive was 50 nm. The thickness of the third protective film was 13 μm. The thickness of the polarizer film (7) used in Comparative Example 1 was 12 μm.

  The polarizing plate of Comparative Example 1 includes a release film 13, an adhesive layer 11 that overlaps the entire release film 13, a third protective film that overlaps the entire adhesive layer 11, and a polarizer 7 that overlaps the entire third protective film, The first protective film 5 that overlaps the entire polarizer 7 and the second protective film 3 that overlaps the entire first protective film 5 were provided.

  A polarizing plate of Comparative Example 1 was produced in the same manner as in Example 1 except for the difference in the laminated structure as described above. The shape of the obtained polarizing plate was the same as the shape of the polarizer 7 shown in FIG. As in the case of Example 1, a heat cycle test using the polarizing plate of Comparative Example 1 was performed.

(Comparative Example 2)
The thickness of the third protective film used in Comparative Example 2 was 23 μm.

  A polarizing plate of Comparative Example 2 was produced in the same manner as in Comparative Example 1 except for the difference in thickness of the third protective film. The shape of the polarizing plate of Comparative Example 2 was the same as the shape of the polarizer 7 shown in FIG. As in the case of Example 1, a heat cycle test using the polarizing plate of Comparative Example 2 was performed.

(Comparative Example 3)
In Comparative Example 3, a film made of an acrylic resin was used as the third protective film. The thickness of the third protective film used in Comparative Example 3 was 20 μm.

  A polarizing plate of Comparative Example 3 was produced in the same manner as Comparative Example 1 except for the difference in the composition and thickness of the third protective film. The shape of the polarizing plate of Comparative Example 3 was the same as that of the polarizer 7 shown in FIG. As in the case of Example 1, a heat cycle test using the polarizing plate of Comparative Example 3 was performed.

(Comparative Example 4)
In Comparative Example 4, the resin layer 9 was not formed. In Comparative Example 4, instead of the resin layer 9, the third protective film was bonded to one surface of the polarizer film (7) through an aqueous adhesive. As the third protective film, a film composed of a cyclic olefin polymer resin (COP resin) was used. The thickness of the third protective film was 13 μm. The thickness of the polarizer film (7) used in Comparative Example 4 was 7 μm. In Comparative Example 4, the first protective film 5 was not used. In Comparative Example 4, instead of the first protective film 5, the entire other surface of the polarizer film (7) was directly covered with the second adhesive layer. The thickness of the 2nd adhesion layer (adhesion layer different from the adhesion layer 11) was 5 micrometers. Furthermore, the entire surface of the second adhesive layer was directly covered with a brightness enhancement film. APF-V3 manufactured by 3M Japan Ltd. was used as the brightness enhancement film. The thickness of the brightness enhancement film was 26 μm.

  The polarizing plate of Comparative Example 4 includes a release film 13, an adhesive layer 11 (first adhesive layer) that overlaps the entire release film 13, a third protective film that overlaps the entire adhesive layer 11, and the entire third protective film. The polarizer 7 which overlaps, the 2nd adhesion layer which overlaps with the whole polarizer 7, and the brightness enhancement film which overlaps with the 2nd adhesion layer were provided.

  A polarizing plate of Comparative Example 4 was produced in the same manner as in Example 1 except for the difference in the laminated structure as described above. The shape of the polarizing plate of Comparative Example 4 was the same as that of the polarizer 7 shown in FIG.

  In the heat cycle test of Comparative Example 4, the polarizing plate bonded to the glass plate includes an adhesive layer 11 (first adhesive layer) that is in close contact with the glass plate, a third protective film that overlaps the entire adhesive layer 11, and a third layer. The polarizer 7 that overlaps the entire protective film, the second adhesive layer that overlaps the entire polarizer 7, and the brightness enhancement film that overlaps the entire second adhesive layer were provided. The heat cycle test of Comparative Example 4 was performed in the same manner as in Example 1 except for the laminated structure of the polarizing plates.

  The results of the heat cycle test for Example 1 and Comparative Examples 1 to 4 are shown in Table 1 below. “A” in the table means that there was no crack in the notch 7 </ b> C of the polarizer 7. “B” means that a crack having a length of 200 μm or less was formed in the notch 7 </ b> C of the polarizer 7. “C” means that a crack having a length of 201 μm or more and 500 μm or less was formed in the notch 7C of the polarizer 7. “D” means that a crack having a length of 501 μm or more was formed in the notch 7 </ b> C of the polarizer 7. “E” means that the crack formed in the notch 7C of the polarizer 7 penetrates the polarizing plate along the surface of the polarizing plate. That is, “E” means that the crack has traversed the entire polarizing plate from the deep portion of the cutout portion 7C toward the second end portion 17e.

Example 1A
In Example 1A, the width W (lateral width of the polarizing plate) of the first end 7e of the polarizer 7 in which the notch 7C was formed was adjusted to 120 mm. A polarizing plate of Example 1A was produced in the same manner as in Example 1 except for the adjustment of the lateral width of the polarizing plate. As in the case of Example 1, a heat cycle test using the polarizing plate of Example 1A was performed.

(Comparative Example 1A)
In Comparative Example 1A, the width W (lateral width of the polarizing plate) of the first end 7e of the polarizer 7 in which the notch 7C was formed was adjusted to 120 mm. A polarizing plate of Comparative Example 1A was produced in the same manner as Comparative Example 1 except for the adjustment of the lateral width of the polarizing plate. As in the case of Comparative Example 1, a heat cycle test using the polarizing plate of Comparative Example 1A was performed.

(Comparative Example 2A)
In Comparative Example 2A, the width W (lateral width of the polarizing plate) of the first end 7e of the polarizer 7 in which the notch 7C was formed was adjusted to 120 mm. A polarizing plate of Comparative Example 2A was produced in the same manner as Comparative Example 2 except for the adjustment of the lateral width of the polarizing plate. As in the case of Comparative Example 2, a heat cycle test using the polarizing plate of Comparative Example 2A was performed.

(Comparative Example 3A)
In Comparative Example 3A, the width W (lateral width of the polarizing plate) of the first end 7e of the polarizer 7 in which the notch 7C was formed was adjusted to 120 mm. A polarizing plate of Comparative Example 3A was produced in the same manner as Comparative Example 3 except for the adjustment of the lateral width of the polarizing plate. As in the case of Comparative Example 3, a heat cycle test using the polarizing plate of Comparative Example 3A was performed.

(Comparative Example 4A)
In Comparative Example 4A, the width W (lateral width of the polarizing plate) of the first end 7e of the polarizer 7 in which the notch 7C was formed was adjusted to 120 mm. A polarizing plate of Comparative Example 4A was produced in the same manner as Comparative Example 4 except for the adjustment of the lateral width of the polarizing plate. As in the case of Comparative Example 4, a heat cycle test using the polarizing plate of Comparative Example 4A was performed.

  The results of the heat cycle test of Example 1A and Comparative Examples 1A to 4A are shown in Table 2 below.

(Example 1B)
In Example 1B, no concave notch was formed on the lateral side (first end) of the second laminate. As shown in FIG. 6, in Example 1B, a circular hole penetrating the second laminate was formed at the center of the surface of the second laminate. The inner diameter φ of this through hole was 2.5 mm. The through hole was formed by press working using a pinnacle blade. In Example 1B, the width W (lateral width of the polarizing plate) of the first end 7e of the polarizer 7 was adjusted to 120 mm.

  A polarizing plate of Example 1B was produced in the same manner as in Example 1 except for the above items. As in the case of Example 1, a heat cycle test using the polarizing plate of Example 1B was performed.

(Comparative Example 1B)
In Comparative Example 1B, no concave notch was formed on the lateral side (first end) of the second laminate. As shown in FIG. 6, in Comparative Example 1B, a circular hole penetrating the second laminate was formed at the center of the surface of the second laminate. The inner diameter φ of this through hole was 2.5 mm. The through hole was formed by press working using a pinnacle blade. In Comparative Example 1B, the width W (lateral width of the polarizing plate) of the first end portion 7e of the polarizer 7 was adjusted to 120 mm.

  A polarizing plate of Comparative Example 1B was produced in the same manner as in Comparative Example 1 except for the above items. As in the case of Comparative Example 1, a heat cycle test using the polarizing plate of Comparative Example 1B was performed.

(Comparative Example 2B)
In Comparative Example 2B, no concave notch was formed on the lateral side (first end) of the second laminate. As shown in FIG. 6, in Comparative Example 2B, a circular hole penetrating the second laminate was formed at the center of the surface of the second laminate. The inner diameter φ of this through hole was 2.5 mm. The through hole was formed by press working using a pinnacle blade. In Comparative Example 2B, the width W (lateral width of the polarizing plate) of the first end 7e of the polarizer 7 was adjusted to 120 mm.

  A polarizing plate of Comparative Example 2B was produced in the same manner as in Comparative Example 2 except for the above items. As in the case of Comparative Example 1, a heat cycle test using the polarizing plate of Comparative Example 2B was performed.

(Comparative Example 3B)
In Comparative Example 3B, no concave notch was formed on the lateral side (first end) of the second laminate. As shown in FIG. 6, in Comparative Example 3B, a hole penetrating the second laminate was formed at the center of the surface of the second laminate. The inner diameter φ of this through hole was 2.5 mm. The through hole was formed by press working using a pinnacle blade. In Comparative Example 3B, the width W (lateral width of the polarizing plate) of the first end 7e of the polarizer 7 was adjusted to 120 mm.

  A polarizing plate of Comparative Example 3B was produced in the same manner as Comparative Example 3 except for the above items. As in the case of Comparative Example 1, a heat cycle test using the polarizing plate of Comparative Example 3B was performed.

The results of the heat cycle test of Example 1B and Comparative Examples 1B to 3B are shown in Table 3 below.
<Evaluation of hot spots>
The polarizing plate of Example 1C similar to Example 1 was produced except that the absorption axis direction da of the polarizer 7 and the direction dc in which the notch 7C extends were parallel. A polarizing plate of Comparative Example 1C similar to Comparative Example 1 was produced, except that the absorption axis direction da of the polarizer 7 and the direction dc in which the notch 7C extends were parallel. A polarizing plate of Comparative Example 1C ′ similar to Comparative Example 1 was produced except that the angle θ formed by the absorption axis direction da of the polarizer 7 and the direction dc in which the notch 7C extends was 45 °.
A sample of Example 1C was prepared in the same manner as in the heat cycle test. The sample was placed in a dried oven and the sample was heated at 85 ° C. for 2 hours. The polarizing plate of Example 1C after heating was observed in a crossed Nicol state.
In the same procedure as in Example 1C, each polarizing plate of Comparative Example 1C and Comparative Example 1C ′ after heating was observed in a crossed Nicols state.
As a result of the above observation, the polarizing plates of Comparative Examples 1C and 1C ′ had light omission (white omission) and heat spots. Light omission (white omission) and heat spots are caused by the fact that each polarizing plate does not include the resin layer 9 and a large shrinkage stress is generated in the stretching direction of the polarizer 7 with heating. On the other hand, in each polarizing plate of Example 1C, there was no light omission (white omission) and heat spots.
In the same procedure as Example 1C, the polarizing plates of Example 1B and Comparative Example 1B after heating were observed in a crossed Nicols state.
As a result of the above observation, the polarizing plate of Comparative Example 1B had light omission (white omission) and heat spots. The light omission (white omission) and heat spots are caused by the fact that the polarizing plate of Comparative Example 1B does not include the resin layer 9 and a large shrinkage stress is generated in the stretching direction of the polarizer 7 with heating. On the other hand, each polarizing plate of Example 1B had no light omission (white omission) and heat spots.

(Examples 2 to 6)
As described below, Examples 2 to 6 were prepared in the same manner as in Example 1 except that the composition of the resin layer 9 was different. That is, the composition of the mixture used for the raw material of each resin layer 9 in Examples 2 to 6 is different from the composition of the mixture used in Example 1.

Examples 2 to 6 As raw materials for the respective resin layers 9, mixtures were prepared from the respective compounds shown in Table 4 below. Examples 2 to 6 The compounding ratio (unit: part by mass) of each compound in each mixture was adjusted to the values shown in Table 4 below.
“CEL2021P” in the following Table 4 is the same as Compound A used in Example 1.
“EHPE3150” in Table 4 below refers to a 1,2-epoxy-4- (2-oxiranyl) cyclohexane adduct of 2,2-bis (hydroxymethyl) -1-butanol manufactured by Daicel Corporation (that is, an epoxy system) Compound).
“EX-214L” in Table 4 below is a member of the Denacol EX-L series manufactured by Nagase ChemteX Corporation and is 1,4-butanediol diglycidyl ether (that is, an epoxy compound).
“VG3101L” in the following Table 4 is the same as the compound B used in Example 1.
“OXT-221” in the following Table 4 is the same as the compound C used in Example 1.
“A-DCP” in Table 4 below is tricyclodecane dimethanol diacrylate (that is, (meth) acrylic compound) manufactured by Shin-Nakamura Chemical Co., Ltd.
“CPI-100P” in Table 4 below is a triarylsulfonium salt type photoacid generator (photocation polymerization initiator) manufactured by San Apro Co., Ltd.
“IRGACURE 1173” in Table 4 below is an old trade name (current trade name: Omnirad 1173) manufactured by IGM Resins B.V. and is 2-hydroxy-2-methyl-1-phenyl-propan-1-one. (Photopolymerization initiator).

  In the same manner as in Example 1, Examples 2 to 6 were subjected to heat cycle tests using the respective polarizing plates. At each time point after 240 cycles and after 500 cycles, Examples 2 to 6 had no cracks in the cutout portions 7C of the respective polarizers 7.

(Examples 2B, 3B, 4B, 5B, 6B)
The composition of the resin layer 9 of Example 2B was the same as the composition of the resin layer 9 of Example 2. The composition of the resin layer 9 of Example 3B was the same as the composition of the resin layer 9 of Example 3. The composition of the resin layer 9 of Example 4B was the same as the composition of the resin layer 9 of Example 4. The composition of the resin layer 9 of Example 5B was the same as the composition of the resin layer 9 of Example 5. The composition of the resin layer 9 of Example 6B was the same as the composition of the resin layer 9 of Example 6.

  Except for the above matters, polarizing plates of Examples 2B, 3B, 4B, 5B, and 6B were prepared in the same manner as in Example 1B. That is, similarly to the polarizing plate of Example 1B, circular through holes were formed in the polarizing plates of Examples 2B, 3B, 4B, 5B, and 6B.

  In the same manner as in Example 1, heat cycle tests were performed using the polarizing plates of Examples 2B, 3B, 4B, 5B, and 6B. At each time point after 240 cycles and after 500 cycles, the notch 7C of each polarizer 7 in Examples 2B, 3B, 4B, 5B, and 6B had no cracks.

  As in Example 1C, the polarizing plates of Examples 2B, 3B, 4B, 5B, and 6B were heated at 85 ° C. for 2 hours, and then the polarized light of Examples 2B, 3B, 4B, 5B, and 6B. The plate was observed in a crossed Nicol state. In any of the polarizing plates of Examples 2B, 3B, 4B, 5B, and 6B, there was no light omission (white omission) and heat spots.

(Examples 2C, 3C, 4C, 5C, 6C)
A polarizing plate of Example 2C similar to Example 2 was produced except that the absorption axis direction da of the polarizer 7 and the direction dc in which the notch 7C extends were parallel.
A polarizing plate of Example 3C similar to Example 3 was produced except that the absorption axis direction da of the polarizer 7 and the direction dc in which the notch 7C extends were parallel.
A polarizing plate of Example 4C similar to Example 4 was produced except that the absorption axis direction da of the polarizer 7 and the direction dc in which the notch 7C extends were parallel.
A polarizing plate of Example 5C similar to Example 5 was produced except that the absorption axis direction da of the polarizer 7 and the direction dc in which the notch 7C extends were parallel.
A polarizing plate of Example 6C similar to Example 6 was produced except that the absorption axis direction da of the polarizer 7 and the direction dc in which the notch 7C extends were parallel.
<Evaluation of hot spots>
In the same manner as in Example 1C, the polarizing plates of Examples 2C, 3C, 4C, 5C, and 6C were heated at 85 ° C. for 2 hours, and then polarized in Examples 2C, 3C, 4C, 5C, and 6C. The plate was observed in a crossed Nicol state. In any of the polarizing plates of Examples 2C, 3C, 4C, 5C, and 6C, there was no light omission (white omission) and heat spots.

  The polarizing plate according to the present invention is applied to, for example, a liquid crystal cell or an organic EL device, and is applied as an optical component constituting an image display device such as a liquid crystal television, an organic EL television, or a smartphone.

  DESCRIPTION OF SYMBOLS 1A, 1Aa, 1B ... Polarizing plate, 3 ... 2nd protective film, 5 ... 1st protective film, 7 ... Polarizer, 7C ... Notch part, 7e ... End part (first end part) of polarizer, 9 ... Resin layer, 10 ... liquid crystal cell, 11 ... adhesive layer, 13 ... release film, 17e ... second end of polarizer, 20A ... liquid crystal panel, 30A ... liquid crystal display device (image display device), 21 ... polarizer A through-hole, da: the absorption axis direction of the polarizer, dc: a direction in which the notch extends, θ: an angle formed by the absorption axis direction of the polarizer and the direction in which the notch extends.

Claims (8)

A film-like polarizer,
A resin layer containing a cured resin,
The resin layer overlaps the polarizer and is in close contact with the polarizer;
A concave notch is formed at the end of the polarizer,
Polarizer. A film-like polarizer,
A resin layer containing a cured resin,
The resin layer overlaps the polarizer and is in close contact with the polarizer;
A hole is formed through the polarizer.
Polarizer. It further comprises an adhesive layer,
The adhesive layer overlaps the resin layer and is in close contact with the resin layer;
The polarizing plate according to claim 1 or 2. The cured resin contains an epoxy compound,
The polarizing plate as described in any one of Claims 1-3. The cured resin contains an oxetane compound,
The polarizing plate as described in any one of Claims 1-4. The cured resin includes a (meth) acrylic compound,
The polarizing plate as described in any one of Claims 1-5. The resin layer is an overcoat layer.
The polarizing plate as described in any one of Claims 1-6. Including the polarizing plate according to any one of claims 1 to 7,
Image display device.

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