KR20190107710A - Polarizer and Image Display - Google Patents

Abstract

The polarizing plate which can suppress the crack of the polarizer resulting from temperature change is provided. The polarizing plate 1A is provided with the film-shaped polarizer 7 and the resin layer 9 containing the resin hardened | cured material, the resin layer 9 overlaps with the polarizer 7, and also the polarizer 7 7C of concave notches are formed in the edge part 7e of the polarizer 7. Alternatively, a hole 21 penetrating the polarizer 7 is formed.

Description

Polarizer and Image Display

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

A polarizing plate is one of the optical components which comprise image display apparatuses, such as a liquid crystal television, an organic EL television, or a smartphone. A polarizing plate is equipped with a film-shaped polarizer and the optical film (for example, protective film) which overlaps with a polarizer. Since most of the general image display apparatuses have a rectangular screen, the conventional polarizing plate mounted on the image display apparatus is also rectangular, and the whole has the same polarizing power. On the other hand, the special image display apparatus has a mold release according to these uses or design reasons, and the conventional polarizing plate mounted in the said apparatus is also a mold release. For example, Patent Literature 1 below describes that a cut-out portion is formed at an end of a polarizer as an injection hole of a liquid crystal. Or the image display apparatus used for a smart watch or an in-vehicle meter may have to form the hole through which the rotating shaft of a guide | route passes. Therefore, it is necessary to form a through hole also in the polarizing plate mounted in an image display apparatus. Since the use and the purpose of a polarizing plate are various, the various cases which must form a notch or a through hole in a polarizing plate are assumed according to a use and an objective.

Patent Document 1: Japanese Patent Application Laid-Open No. 2000-155325

The polarizer expands or contracts with temperature changes. As a result of the study by the inventors, it was found that due to the shrinkage of the polarizer due to the temperature change, cracks of the polarizer were formed at the cutouts or through holes. In particular, cracks tend to be formed due to thermal shock (rapid temperature change).

This invention is made | formed in view of the said situation, and an object of this invention is to provide 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.

The polarizing plate which concerns on one aspect of this invention is equipped with the film-shaped polarizer and the resin layer containing resin cured material, a resin layer is superimposed on a polarizer, and is closely adhered to a polarizer, and the recessed notch part Is formed at the end of the polarizer.

The polarizing plate which concerns on another aspect of this invention is equipped with the film type polarizer and the resin layer containing resin hardened | cured material, and a resin layer overlaps with a polarizer, is in close contact with a polarizer, and is a hole which penetrates a polarizer. Is formed.

The polarizing plate which concerns on the said side surface of this invention may further be equipped with an adhesion layer, and an adhesion layer may overlap with a resin layer, and may be in close contact with a resin layer.

In the said aspect of this invention, the resin hardened | cured material may also contain an epoxy-type compound.

In the said aspect of this invention, the resin hardened | cured material may also contain an oxetane type compound.

In the said aspect of this invention, the resin hardened | cured material may also contain a (meth) acrylic-type compound.

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

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

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.

1 is a schematic perspective view of a polarizing plate according to a first embodiment of the present invention.
FIG. 2 is a top view of a polarizer included in the polarizing plate illustrated in FIG. 1.
It is a schematic diagram of the cross section of the image display apparatus (liquid crystal display apparatus) which concerns on 1st Embodiment of this invention.
4: (a) in FIG. 4 is a top view of the polarizer with which the modification of 1st Embodiment of this invention is equipped, (b) in FIG. 4 is the top surface of the polarizer with which the modification of 1st Embodiment of this invention is equipped. It is a figure, (c) in FIG. 4 is a top view of the polarizer with which the modification of 1st Embodiment of this invention is equipped, (d) in FIG. 4 is the top surface of the polarizer with which the modification of 1st Embodiment of this invention is equipped. It is also.
5 is a top view of the polarizer included in the embodiment of the present invention.
It is a typical perspective view of the polarizing plate which concerns on 2nd Embodiment of this invention.

EMBODIMENT OF THE INVENTION Hereinafter, preferred embodiment of this invention is described, referring drawings. In the drawings, equivalent components are denoted by the same reference numerals. This 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 the drawings.

[First Embodiment]

Based on FIG. 1 and FIG. 2, 1st Embodiment of this invention is described. The polarizing plate 1A according to the first embodiment includes a film polarizer 7, a resin layer 9, and a plurality of optical films 3, 5, 13. The polarizer 7, the resin layer 9, and the optical films 3, 5, 13 are all rectangular. An "optical film" means the film-shaped member (except polarizer itself) which comprises a polarizing plate. The optical film may be referred to as a layer or an optical layer. An optical film contains a protective film and a release film, for example. In 1st Embodiment, the some optical films 3, 5, 13 are the 1st protective film 5, the 2nd protective film 3, and the release film 13 (separator). That is, 1 A of polarizing plates are equipped with the polarizer 7, the 1st protective film 5, the resin layer 9, the 2nd protective film 3, and the release film 13. The polarizing plate 1A is also equipped with the adhesion layer 11 located between the resin layer 9 and the release film 13.

 The resin layer 9 is superposed on the entire surface of one of the polarizers 7 and is in close contact with the entire surface of one of the polarizers 7. The adhesion layer 11 is superposed on the whole surface of the resin layer 9, and is firmly in contact with the whole surface of the resin layer 9. The release film 13 has covered the whole surface of the adhesion layer 11. The 1st protective film 5 is overlapped with the whole other surface of the polarizer 7, and is adhere | attached on the whole 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 contains cured resin. The resin layer 9 may consist only of the cured resin. The resin layer 9 is a layer formed by curing a curable resin composition. Since the resin layer 9 has a three-dimensional crosslinked structure, the resin layer 9 is harder than resin films such as the optical films 3, 5, and 13. The resin layer 9 is distinguished from resin films, such as the optical films 3, 5, 13, based on the crosslinked structure, the composition of a monomer, or the difference of a molecular structure.

At the end (first end 7e) of the polarizer 7, a concave cut-out portion 7C is formed. This notch 7C is a polarizer 7 in the lamination direction (Z-axis direction) of the polarizer 7, the resin layer 9, the optical films 3, 5, 13, and the adhesive layer 11. It penetrates all the resin layer 9, the optical films 3, 5, 13, and the adhesion layer 11. That is, the end surface of the polarizing plate 1A has a concave shape 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 1A. The notch of is formed. The shape of the notch 7C of the polarizer 7 seen from the lamination direction (Z-axis direction) may be the same as or similar to the shape of the notch of the polarizing plate 1A seen from the lamination direction. The shape of the notch of the polarizing plate 1A seen from the lamination direction may be regarded as the shape of the notch 7C of the polarizer 7 seen from the laminated direction. Hereinafter, not only the notch 7C of the polarizer 7 but also the notch of the polarizing plate 1A containing the notch 7C may be described as "notch 7C." The notch 7C is rectangular, for example.

As described below, the polarizer 7 tends to break along the absorption axis of the polarizer 7. That is, the crack of the polarizer 7 tends to be formed along the absorption axis of the polarizer 7. Here, you may say that an absorption axis is a straight line substantially parallel to the orientation direction of the polyvinyl alcohol (PVA) molecule | numerator in the polarizer 7, for example. For example, the absorption axis may be referred to as a straight line substantially parallel to the alignment direction of the dye molecules (for example, polyiodine or organic dye) adsorbed to the polyvinyl alcohol in the polarizer 7. Many carbon atoms constituting one PVA molecule can be said to be bonded to each other by a covalent bond (C-C bond) along the absorption axis. On the other hand, in the direction substantially perpendicular to the absorption axis, PVA molecules are bonded by crosslinking via a crosslinking 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 boric acid and a hydrogen bond or an oxygen-boron bond (OB bond) located between the PVA molecules, whereby the PVA molecules are crosslinked. have. C-C bonds formed along the absorption axis are stronger than crosslinks 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, thermal contraction of the polarizer 7 in a direction substantially parallel to the absorption axis is less likely to cause cracks than thermal contraction of the polarizer 7 in a direction substantially perpendicular to the absorption axis. On the other hand, in the direction orthogonal to the absorption axis, weak crosslinking bonds are formed compared to C-C bonds in the PVA molecules. Therefore, thermal contraction of the polarizer 7 in a direction substantially perpendicular to the absorption axis tends to generate cracks as compared with thermal contraction of the polarizer 7 in a direction substantially parallel to the absorption axis. The anisotropy of the mechanical strength in the polarizer 7 as described above is particularly likely to cause cracks in the polarizer 7 in the notch 7C. Since the direction of the end surface of the polarizer 7 exposed in the notch 7C is not constant and the same as the absorption axis of the polarizer 7, the notch part when the polarizer 7 shrinks with temperature change. (7C) does not shrink equally. As a result, a stress tends to generate | occur | produce in the localization of the end surface of the polarizer 7 exposed in notch 7C. Due to this stress, cracks starting from the cutout portion 7C are likely to be formed along the absorption axis of the polarizer 7. For example, when the deep portion (inner portion) of the cutout portion 7C contracts in a direction substantially perpendicular to the absorption axis, cracks are likely to be formed along the absorption axis in the core portion of the cutout portion 7C. In addition, the crack of the polarizer 7 in the notch 7C originates also in the process for forming the notch 7C. Unlike the case where the linear end of the polarizing plate 1A is formed, in the process of forming the concave notch 7C at the end of the polarizing plate 1A, the laminate constituting the polarizing plate 1A, in particular, the polarizer 7 ) Is likely to be loaded. By the load at the time of this process, a minute wound tends to generate | occur | produce in the edge part of the polarizer 7 exposed in the notch 7C. This minute wound tends to be a starting point of the crack at the time of thermal contraction of the polarizer 7.

However, in the first embodiment, as described below, since the resin layer 9 is in close contact with the polarizer 7, cracks in the polarizer 7 at the notch 7C due to temperature change are suppressed. . Even if stress is generated in the polarizer 7 shrinking due to the temperature change, the resin layer 9 in close contact with the polarizer 7 is hard and hard to be broken, so that the polarizer 7 in close contact with the resin layer 9 Cracks are also suppressed. As mentioned 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 this mechanism, the crack of the polarizer 7 in the notch 7C is suppressed, regardless of the position relationship of the position, the direction, and the shape of the notch 7C, and the position of 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 is not yet clarified. The reason why the crack of the polarizer 7 is suppressed is not limited to the above. In addition, since the polarizing plate 1A includes the resin layer 9, light leakage (white spot) and thermal unevenness in the polarizing plate 1A (particularly around the cutout 7C) are suppressed.

 The resin layer 9 may be an overcoat layer. The overcoat layer may be referred to as a layer formed by curing an uncured curable resin composition covering the surface of the polarizer 7. For example, the uncured curable resin is directly coated on the surface of the polarizer 7 to form a layer (uncured layer) containing the uncured curable resin, and the uncured layer is cured to obtain a resin layer 9. Also good. Alternatively, an uncured layer is formed on the surface of the base film, the uncured layer is transferred from the base film to the surface of the polarizer 7, and the uncured layer transferred to the surface of the polarizer 7 is cured. You may obtain the resin layer 9. When the uncured layer is brought into close contact with the surface of the polarizer 7, the relatively soft uncured layer is likely to penetrate into the minute unevenness of the surface of the polarizer 7 without a gap, and the resin layer 9 obtained by curing of the uncured layer is also It is easy to penetrate into the minute unevenness | corrugation of the surface of the polarizer 7 without a gap. As a result, an anchor effect may arise and the crack of the polarizer 7 in the notch 7C may be easily suppressed by the anchor effect.

 The absorbance increase rate of the resin layer 9 may be 0% or more and 30% or less. The absorbance increase rate is defined by the following formula (A).

Absorbance increase rate (%) = {(Absf-Absi) / Absi} × 100 (A)

"Absf" is the absorbance in 360 nm of the resin layer 9 after the immersion treatment. Immersion treatment means immersing the resin layer 9 in 50% of potassium iodide aqueous solution for 100 hours in the atmosphere of temperature 23 degreeC, and 60% of a relative humidity. Before the measurement of absorbance, 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.

 As the absorbance increase rate of the resin layer 9 is lower, the resin layer 9 is less likely to absorb iodine (dichroic dye). When the absorbance increase rate of the resin layer 9 is 30% or less, the movement of the iodine (dichroic dye) contained in the polarizer 7 to the resin layer 9 is effectively suppressed, and due to iodine (dichroic dye) Corrosion of other layers (for example, conductive layers such as ITO layers) is suppressed. Moreover, when the absorbance increase rate of the resin layer 9 is 30% or less, the optical performance of the polarizing plate 1A is easy to be maintained.

 The lower the absorbance increase rate of the resin layer 9 is, the more preferable. The absorbance increase rate of the resin layer 9 may be 0% or more and 25% or less, 0% or more and 20% or less, 0% or more and 15% or less, 0% or more and 10% or less, or 0% or more and 3% or less. As the absorbance increase rate of the resin layer 9 is lower, as described above, the movement of the iodine (dichroic dye) contained in the polarizer 7 to the resin layer 9 tends to be suppressed, and another layer (for example, a conductive layer) Corrosion is easy to be suppressed, and deterioration of the optical performance of the polarizing plate 1A is easy to be suppressed.

The photoelastic coefficient of the resin layer 9 may be 0 or more and less than 10 ^-12 (less than a measurement limit), or 0 or more and 10 ^-13 or less. The photoelastic coefficient of the resin layer 9 is small, and smaller than the photoelastic coefficient of another optical film (for example, protective film), the light leakage (white spot) and thermal nonuniformity in 1A of polarizing plates are easy to be suppressed. The photoelastic coefficient may be measured by a phase difference measuring device (elliptical polarization measuring device). As a phase difference measuring apparatus, you may use "KOBRA-WPR" by Oji Keisoku Kiki Co., Ltd. product. In the measurement of the photoelastic coefficient, the dimension of the resin layer 9 is adjusted to 2 cm x 10 cm. The phase difference value (23 ° C / wavelength 590 nm) in the center of the resin layer 9 is determined while sandwiching both ends of the resin layer 9 and applying a stress of 5 to 15 N to the resin layer 9. Measure From the slope of the function of the stress and the retardation value, the photoelastic coefficient is calculated.

Even if the width Wc of the notch 7C in the direction parallel to the edge part (1st edge part 7e) of the polarizer 7 is 2 mm or more and less than 600 mm, or 5 mm or more and 30 mm or less, for example, good. The width W of the whole polarizer 7 in the direction parallel to the edge part (1st edge part 7e) in which the notch 7C was formed may be 30 mm or more and 600 mm or less, for example. The width Wc of the notch 7C may be, for example, less than the width W of the entire polarizer 7. 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 preferably 160 mm or less. May be greater than 25 mm and 130 mm or less, more preferably greater than 30 mm and 100 mm or less, more preferably greater than 30 mm and 80 mm or less (however, Wc < W). The ratio (Wc / W) of 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. 1.0 or more, 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, still more preferably 0.30 or more and less than 1.0, or 0.33 or more and less than 1.0. Wc / W may be referred to as the ratio between the width Wc of the notch 7C and the width W of the entire polarizing plate 1A. When the ratio Wc / W is in the above range, the crack in the notch 7C is easily suppressed. The reason for this is as follows. As the width Wc of the notch 7C is smaller than the width W of the polarizer 7 as a whole, the width Wc of the notch 7C is reduced by shrinkage of the entire polarizer 7 due to temperature change. The spreading force tends to occur, and cracks tend to occur in the notch 7C. That is, the smaller the Wc / W, the more likely the crack is to occur in the notch 7C. On the other hand, the larger the Wc / W (the smaller the width W of the entire polarizer 7), the smaller the shrinkage amount of the entire polarizer 7 due to the temperature change. That is, the smaller the width W of the whole polarizer 7 is, the smaller the absolute value of the change amount of the width W of the whole polarizer 7 is. By reducing the shrinkage amount of the entire polarizer 7 due to the temperature change, a force for widening the width Wc of the notch 7C is hardly generated, and the crack in the notch 7C is easily suppressed. However, even when Wc / W is outside the above-mentioned numerical range, it is possible to suppress the crack in the notch 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 referred to as the depth of the notch 7C in the direction perpendicular to the end (first end 7e). The length D of the whole 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 or more and 1200 µm or less, 10 µm or more and 500 µm or less, 10 µm or more and 300 µm or less, or 10 µm or more and 200 µm or less.

The manufacturing method of 1 A of polarizing plates is equipped with the bonding step and the processing step at least. In the bonding step, the resin layer 9 is formed on the surface of the elongated 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 elongate strip-shaped polarizer film is a polarizer 7 before processing and molding. The long strip | belt-shaped several optical film is the optical film 3, 5, 13 before a process and the shaping | 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 prepared by combining the above-described cutting using a cutlery, punching processing, and cutting using a laser. Even if a 1st laminated body is processed by the above-mentioned processing method, the dimension of a 1st laminated body is adjusted to larger than a predetermined dimension, and the edge part of a 1st laminated body is cut and polished by a phrase, even if it manufactures a 2nd laminated body. good.

In the processing step, for example, a concave notched portion 7C may be formed at the first end 7e of the second laminate by punching or cutting using a blade or a laser. In the machining step, the second laminated body having the cutout portions 7C formed therein may be subjected to an end machining step. In the end working step, for example, an end mill may be used to cut and polish the end face of the second laminate including the notched portion 7C. An end mill is one kind of phrase for cutting. The end mill is, for example, a blade located on a side surface substantially parallel to the rotational axis, and cuts and polishes the end face of the second laminate including the notch 7C. As a result, the end face of the 2nd laminated body containing the notch 7C is smoothed. By using this end mill, it is possible to shape | mold the 2nd laminated body into 1 A of polarizing plates which have a desired shape and dimension in a short time. That is, productivity of 1 A of polarizing plates improves. In the machining step, the first laminate may be punched out larger than before to produce the second laminate, and in the subsequent end machining step, the end face of the second laminate may be cut and polished with an end mill. As a result, the margin of the end removed from the second laminate in the end machining step is reduced, and the generation of foreign matters such as polishing debris in the end machining step is suppressed, and the foreign matter product (polarizing plate 1A). ) Is suppressed.

Instead of forming the notch 7C in the machining step, in the end machining step following the machining step, the recessed notch 7C may be formed at the first end 7e of the second laminate. In the edge processing step, for example, the notched portion 7C may be formed in the second laminate by irradiating the edge of the second laminate to cut an end or part of the edge. The notch 7C may be formed in the second laminate by the end machining step using the end mill described above.

 The resin cured material constituting the resin layer 9 may be formed of a photocurable resin composition that is cured by irradiation with an active energy ray. The resin cured material constituting the resin layer 9 may be formed of a thermosetting resin composition that is cured by heating. The resin cured material which comprises the resin layer 9 may contain an epoxy compound. The resin cured material which comprises the resin layer 9 may also contain an oxetane type compound. The resin cured material which comprises the resin layer 9 may also contain a (meth) acrylic-type compound. Below, the specific example of curable resin composition suitable for formation of the resin layer 9 (resin cured material) is demonstrated in detail.

<Curable resin composition for the resin layer 9>

 It is preferable that the curable resin composition used for formation of the resin layer 9 contains an epoxy-type compound which has at least 1 epoxy group in a molecule | numerator as an active energy ray curable compound. By using curable resin composition containing such an epoxy compound, the resin layer 9 shows favorable adhesiveness with respect to the polarizer 7, and is a polarizing plate with high durability performance excellent in transparency, mechanical strength, thermal stability, moisture barrier property, etc. (1A) can be obtained. "The epoxy compound which has at least one epoxy group in a molecule" means the compound which has one or more epoxy groups in a molecule | numerator, and can harden | cure by irradiation of an active energy ray. It is preferable that especially this epoxy compound has at least 2 epoxy groups in a molecule | numerator. An "active energy ray curable compound" is a meaning which generically refers to the curable resin composition which contains the oxetane type compound and (meth) acrylic compound mentioned later including an epoxy type compound and can harden | cure by irradiation of an active energy ray.

(Active energy ray curable compound 1: Cationic polymerizable compound)

Examples of the epoxy compound constituting the curable resin composition include glycidyl ethers of polyols having alicyclic rings, alicyclic epoxy compounds, aliphatic epoxy compounds, aromatic epoxy compounds and the like.

Glycidyl ether of the polyol having an alicyclic ring is a compound obtained by glycidyl etherifying the hydroxyl group of the compound which has at least 2 hydroxyl groups in a molecule | numerator connected to an alicyclic ring. The polyol having an alicyclic ring, ie, the compound having at least two hydroxyl groups bonded to the alicyclic ring, may be obtained by selectively hydrogenating an aromatic polyol to an aromatic ring under pressure in the presence of a catalyst. Aromatic polyols include, for example, bisphenol type compounds such as bisphenol A, bisphenol F and bisphenol S; Novolak-type resins such as phenol novolak resin, cresol novolak resin and hydroxybenzaldehyde phenol novolak resin; Polyfunctional compounds such as tetrahydroxydiphenylmethane, tetrahydroxybenzophenone and polyvinylphenol. It can be set as glycidyl ether by making epichlorohydrin react with the alicyclic polyol obtained by performing a hydrogenation reaction to the aromatic ring of these aromatic polyols. Among these, preferable is the diglycidyl ether of hydrogenated bisphenol A.

An alicyclic epoxy compound is a compound which has at least one epoxy group couple | bonded with an alicyclic ring in a molecule | numerator. "The epoxy group couple | bonded with the alicyclic ring" means the oxygen atom -O- of bridge | crosslinking in the structure shown by following formula (1), and m is an integer of 2-5 in this formula.

The compound that is (CH _{2) m} combine the hydrogen atom in the one or more types of different chemical structure group is removed in the above formula (1) it may be a cycloaliphatic epoxy compound. One or a plurality of hydrogen atoms in (CH ₂ ) _m forming an alicyclic ring may be appropriately substituted with a linear alkyl group such as a methyl group or an ethyl group. Among the alicyclic epoxy compounds, the epoxy compound having an epoxy cyclopentane ring (m = 3 in the above formula) or an epoxycyclohexane ring (m = 4 in the above formula) has an elastic modulus of the cured product. It is high, and since it is excellent in adhesiveness with the polarizer 7, it is used more preferably.

Specific examples of the alicyclic epoxy compound are listed below. In the following, the compound name is first given, followed by the chemical formula corresponding to each compound name. The compound name and the chemical formula corresponding thereto are assigned the same symbol.

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-epoxycyclohexylmethyl ether),

G: ethylene glycol bis (3,4-epoxycyclohexyl methyl ether),

H: 2,3,14,15-diepoxy-7,11,18,21-tetraoxatrisspiro [5.2.2.5.2.2] henic acid,

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 compound may be an aliphatic polyhydric alcohol or polyglycidyl ether of an alkylene oxide adduct thereof. Aliphatic epoxy compounds are, for example, diglycidyl ether of 1,4-butanediol, diglycidyl ether of 1,6-hexanediol, triglycidyl ether of glycerin, triglycidyl ether of trimethylolpropane, and polyethylene Polyglycol of polyether polyol obtained by adding alkylene oxide (ethylene oxide or propylene oxide) to aliphatic polyhydric alcohols such as diglycidyl ether of glycol, diglycidyl ether of propylene glycol, ethylene glycol, propylene glycol, glycerin Cyl ether.

From the viewpoint of improving the adhesion between the polarizer 7 and the adhesive layer 11, the aliphatic epoxy compound included in the curable resin composition is a bifunctional epoxy having two oxirane rings bonded to aliphatic carbon atoms in a molecule thereof. It is preferable that it is a 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 which has one or more aromatic rings in a molecule | numerator. Specific examples of the aromatic epoxy compound are listed below.

Monovalent polyphenols having at least one aromatic ring such as phenol, cresol, butylphenol or the like, or mono / polyglycidyl ether compounds of alkylene oxide adducts thereof such as bisphenol A, bisphenol F, or alkylene oxides Glycidyl ether compounds and epoxy novolac resins of the added compounds;

Glycidyl ethers of aromatic compounds having two or more phenolic hydroxyl groups such as resorcinol, hydroquinone and catechol;

Mono / polyglycidyl ether compounds of aromatic compounds having two or more alcoholic hydroxyl groups such as benzenedimethanol, benzenediethanol and benzenedibutanol;

Glycidyl esters of polybasic acid aromatic compounds having two or more carboxylic acids such as phthalic acid, terephthalic acid and trimellitic acid;

Glycidyl esters of benzoic acids such as benzoic acid, toluic acid and naphthoic acid;

Epoxides of styrene oxide or divinylbenzene;

From the viewpoint of low viscosity of the curable composition, the aromatic epoxy compound is 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, and a glyc of benzoic acid. It is preferable to contain at least 1 sort (s) chosen from the group which consists of a cydyl ester, glycidyl ester of polybasic acids, styrene oxide, or divinylbenzene. Moreover, as an aromatic epoxy compound, it is preferable that epoxy equivalent is 80-500 from the point which improves sclerosis | hardenability of a curable composition. One type of aromatic epoxy compound may be used alone, or a plurality of different types of aromatic epoxy compounds may be used in combination.

A commercial item can be used as an aromatic epoxy compound. The brand name of the commercial item of an aromatic epoxy compound is 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, Oncoat EX-1020, Oncoat EX-1030, Oncoat EX-1040, Oncoat EX-1050, Oncoat EX-1051 , On coat EX-1010, on coat EX-1011, on coat 1012 (above, manufactured by Nagase Chemtex); Ogsol PG-100, Ogsol EG-200, Ogsol EG-210, Ogsol EG-250 (above, the Osaka Gas Chemical Company make); HP4032, HP4032D, HP4700 (above, manufactured by DIC Corporation); ESN-475V (manufactured by Shinnitetsu Sumikin Kagaku Co., Ltd.); Epicoat YX8800 (manufactured by Mitsubishi Chemical Corporation); Mapruf G-0105SA, mapruf G-0130SP (manufactured by Nichi Oil Co., Ltd.); Epiclone N-665, Epiclone HP-7200 (above, manufactured by DIC Corporation); 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.); Adeka Glycerol ED-501, Adeka Glycyrrole ED-502, Adeka Glycyrrole ED-509, Adeka Glycerol ED-529, Adeka Resin EP-4000, Adeka Resin EP-4005, Adeka Resin EP-4100 and Adeka Resin EP-4901 (above, manufactured by ADEKA Corporation); TECHMORE VG-3101L, EPOX-MKR710, and EPOX-MKR151 (above, manufactured by Printtec).

When curable resin composition contains an aromatic epoxy compound, curable resin composition turns into hydrophobic resin, and the hardened | cured material layer (resin layer 9) obtained by this can also have hydrophobicity. As a result, invasion of moisture into the polarizing plate 1A from the outside under high temperature and high humidity is suppressed, and the movement of the dichroic dye (iodine) contained in the polarizer 7 is effectively suppressed.

In curable resin composition, an epoxy type compound may respectively be used independently and may use 2 or more types together. Since the resin layer 9 which is excellent in adhesiveness with respect to the polarizer 7 is obtained, it is preferable that curable resin composition contains an alicyclic epoxy-type compound at least.

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 content of an epoxy type compound is less than 30 weight%, there exists a tendency for adhesiveness with the polarizer 7 to fall.

Moreover, in addition to said epoxy type compound, you may mix | blend an oxetane type compound with curable resin composition. By adding an oxetane type compound, the viscosity of curable resin composition can be made low and a cure rate can be made quick. Moreover, the effect of preventing yellowing of a cured film and improving optical durability is also anticipated.

An oxetane type compound is a compound which has a 4-membered ring ether in a molecule | numerator. The oxetane-based compound is, for example, 3-ethyl-3-hydroxymethyloxetane, 1,4-bis [(3-ethyl 3-oxetanyl) methoxymethyl] benzene, 3-ethyl-3- (phenoxy Methyl) oxetane, bis (3-ethyl-3-oxetanylmethyl) ether, 3-ethyl-3- (2-ethylhexyloxymethyl) oxetane, phenol novolac oxetane and the like. It is possible to easily obtain the commercial item of these oxetane compounds. For example, the brand names of the oxetane compound sold from Toagosei Co., Ltd. are "Aron Oxetane OXT-101", "Aron Oxetane OXT-121", "Aron Oxetane OXT-211", "Aron Oxetane OXT" -221 "," Aron Oxetane OXT-212 ", and the like. Although the compounding quantity of an oxetane type compound is not specifically limited, Based on the whole quantity of an active-energy-ray-curable compound, 70 weight% or less, Preferably 10-50 weight% may be sufficient.

The composition of the curable resin composition is based on 100% by mass of the total amount of the polymerizable compound (the entire curable resin composition),

(A1) 35-70 mass% of the oxetane compound which has two or more oxetanyl groups,

(A2) 0-40 mass% of aliphatic epoxy compounds which have two or more epoxy groups,

(A3) 15-50 mass% of alicyclic epoxy compounds which have two or more epoxy groups, and

(A4) It is preferable that it is 0-20 mass% of the aromatic epoxy compound which has one or more aromatic rings.

When curable resin composition contains an oxetane compound (A) and an alicyclic epoxy compound (B1), of content (WB1) of alicyclic epoxy compound (B1) with respect to content (WA) of an oxetane compound (A) It is preferable that mass ratio (WB1 / WA) is 0.05-1.5.

When curable resin composition contains an oxetane compound (A) and an aliphatic epoxy compound (B2), the mass ratio of content (WB2) of an aliphatic epoxy compound (B2) with respect to content (WA) of an oxetane compound (A) ( It is preferable that WB2 / WA) is 0.1-0.5.

When curable resin composition contains an oxetane compound (A) and an aromatic epoxy compound (B3), the mass ratio of content (WB3) of aromatic epoxy compound (B3) with respect to content (WA) of an oxetane compound (A) ( It is preferable that WB3 / WA) is 0.1-1.5.

(Polymerization initiator 1: Photocationic polymerization initiator)

When curable resin composition contains the cationically polymerizable compound like an epoxy compound and an oxetane type compound, it is preferable to mix | blend a photocationic polymerization initiator with this curable resin composition. By using a photocationic polymerization initiator, formation of the resin layer 9 at normal temperature becomes possible, and the necessity to consider the deformation | transformation by the heat resistance or expansion of the polarizer 7 is reduced, and the resin layer 9 is applied to the polarizer 7. ) Is easy to close. Moreover, since a photocationic polymerization initiator acts catalytically with light, even if it mixes with curable resin composition, it is excellent in storage stability and workability.

A photocationic polymerization initiator generates a cationic species or Lewis acid by irradiation of active energy rays, such as visible light, an ultraviolet-ray, X-ray, and an electron beam, and starts the polymerization reaction of an epoxy type compound and / or an oxetane type compound. From the viewpoint of workability, it is preferable that the potential is imparted to the photocationic polymerization initiator. Examples of the photocationic polymerization initiator include aromatic diazonium salts; Onium salts such as aromatic iodonium salts and aromatic sulfonium salts; Iron-arene complexes;

The specific example of aromatic diazonium salt is as follows.

Benzenediazonium hexafluoroantimonate,

Benzenediazonium hexafluorophosphate,

Benzenediazonium hexafluoroborate and the like.

The specific example of aromatic iodonium salt is as follows.

Diphenyl iodonium tetrakis (pentafluorophenyl) borate,

Diphenyl iodonium hexafluorophosphate,

Diphenyl iodonium hexafluoroantimonate,

Bis (4-nonylphenyl) iodonium hexafluorophosphate and the like.

The specific example of aromatic sulfonium salt is as follows.

Triphenylsulfonium hexafluorophosphate,

Triphenylsulfonium hexafluoroantimonate,

Triphenylsulfonium tetrakis (pentafluorophenyl) borate,

4,4'-bis (diphenylsulfonio) diphenylsulfide bishexafluorophosphate,

4,4'-bis [di (β-hydroxyethoxy) phenylsulfonio] diphenylsulfide bishexafluoroantimonate,

4,4'-bis [di (β-hydroxyethoxy) phenylsulfonio] diphenylsulfide bishexafluorophosphate,

7- [di (p-toluyl) sulfonio] -2-isopropylthioxanthone hexafluoroantimonate,

7- [di (p-toluyl) sulfonio] -2-isopropylthioxanthone tetrakis (pentafluorophenyl) borate,

4-phenylcarbonyl-4'-diphenylsulfoniodiphenylsulfide hexafluorophosphate,

4- (p-tert-butylphenylcarbonyl) -4'-diphenylsulfoniodiphenylsulfide hexafluoroantimonate,

4- (p-tert-butylphenylcarbonyl) -4'-di (p-toluyl) sulfoniodiphenylsulfide 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) metanide and the like.

It is possible to easily obtain the commercial item of these photocationic polymerization initiators. Commercial names of photocationic polymerization initiators are "Kayarad PCI-220" and "Kayarad PCI-620" (above, manufactured by Nippon Kayaku Co., Ltd.), "Adeka Optomer SP-150" and "Adeca" Optomer SP-170 "(above, manufactured by ADEKA Corporation)," UVACURE 1590 "(manufactured by Daicel Cytec Co., Ltd.)," CI-5102 "," CIT-1370 "," CIT-1682 "," CIP-1866S "," CIP-2048S "and" CIP-2064S "(above, 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-101", "TPS-102", " TPS-103 "," TPS-105 "," MDS-103 "," MDS-105 "," DTS-102 "and" DTS-103 "(above, manufactured by Midori Kagaku Co., Ltd.)," UVI-6990 " "Union Carbide Co., Ltd.", "PI-2074" [Rodia Co., Ltd.], etc. are mentioned.

These photocationic polymerization initiators may be used independently, respectively and may use 2 or more types together. Among these, in particular, the aromatic sulfonium salt is excellent in curability because it has ultraviolet absorbing properties even in a wavelength range of 300 nm or more, and can provide a cured product having good mechanical strength and good adhesion with the polarizer 7. Is used.

The compounding quantity of a photocationic polymerization initiator is 0.5-20 weight part, Preferably it is 10 weight part or less, More preferably 1-, with respect to a total of 100 weight part of the cationically polymerizable compound containing an epoxy type compound and an oxetane type compound. 6 parts weight may be sufficient. When there is little compounding quantity of a photocationic polymerization initiator, hardening becomes inadequate and there exists a tendency for the mechanical strength and adhesiveness of the resin layer 9 and the polarizer 7 to fall. On the other hand, when the compounding quantity of a photocationic polymerization initiator is too big | large, the hygroscopicity of hardened | cured material becomes high by increasing the ionic substance in hardened | cured material, and there exists a possibility that durability performance may fall.

(Active energy ray curable compound 2: 2: radically polymerizable compound)

Curable resin composition used for this invention may contain the radically polymerizable compound which can superpose | polymerize by irradiation of an active energy ray in presence of a polymerization initiator in addition to cationically polymerizable compounds, such as the epoxy-type compound mentioned above. Moreover, curable resin composition can also be comprised using only a radically polymerizable compound as an active energy ray curable compound. As a radically polymerizable compound, the (meth) acrylic-type compound which has at least 1 (meth) acryloyloxy group in a molecule | numerator is used suitably. In addition, a (meth) acrylic-type compound means that any of acrylic acid ester and methacrylic acid ester may be sufficient, In addition, in this specification, (meth) acryloyl, (meth) acrylate, (meth) acrylic acid, etc. "(Meth)" when said is also the same meaning.

The (meth) acrylic compound having at least one (meth) acryloyloxy group in a molecule has two kinds of a (meth) acrylate monomer having at least one (meth) acryloyloxy group in a molecule or a compound having a functional group. It is obtained by making it react above, and contains the (meth) acrylate oligomer etc. which have at least 2 (meth) acryloyloxy group in a molecule | numerator. Although these monomers and oligomers are demonstrated concretely below, these can be used individually, respectively, and can also be used in combination of 2 or more type as needed. The combination of two or more types includes combinations of monomers and combinations of oligomers, and also includes a combination of one or two or more kinds of monomers and one or two or more kinds of oligomers.

In the (meth) acrylate monomer, a monofunctional (meth) acrylate monomer having one (meth) acryloyloxy group in a molecule, a bifunctional (meth) acrylate having two (meth) acryloyloxy groups in a molecule There exists a monomer and the polyfunctional (meth) acrylate monomer which has three or more (meth) acryloyloxy groups in a molecule | numerator.

The specific example of a monofunctional (meth) acrylate monomer is 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) acrylates and the like.

Moreover, the compound which has a carboxyl group in a molecule with one (meth) acryloyloxy group can also be a monofunctional (meth) acrylate monomer. The specific example of the monofunctional (meth) acrylate monomer which has a carboxyl group is as follows.

2- (meth) acryloyloxyethyl phthalic 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 several difunctional (meth) acrylate monomers. Representative bifunctional (meth) acrylate monomers include alkylene glycol di (meth) acrylates, polyoxyalkylene glycol di (meth) acrylates, halogen substituted alkylene glycol di (meth) acrylates, and aliphatic polyols Di (meth) acrylates, di (meth) acrylates of hydrogenated dicyclopentadiene or tricyclodecanedialkanol, di (meth) acrylates of dioxane glycol or dioxanedialkanol, bisphenol A or Di (meth) acrylates of alkylene oxide adducts of bisphenol F, bisphenol A or epoxy di (meth) acrylates of bisphenol F;

The specific example of a bifunctional (meth) acrylate monomer is 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,

Neopentylglycol 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 hydroxy pivalate 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 of Acetal Compound [Chemical Name: 2- (2-hydroxy-1,1-dimethylethyl) -5-ethyl-5-hydroxymethyl-1,3-dioxane] of hydroxypivalaldehyde and trimethylolpropane (Meth) acrylate,

Di (meth) acrylate of 1,3,5-tris (2-hydroxyethyl) isocyanurate and the like.

There exist various things in the trifunctional or more than trifunctional (meth) acrylate monomer. For example, poly (meth) acrylates of trivalent or higher aliphatic polyols are representative. The specific example is 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 and the like.

In addition, poly (meth) acrylate of trivalent or more halogen-substituted polyol, tri (meth) acrylate of alkylene oxide adduct of glycerin, tri (meth) acrylate of alkylene oxide adduct of trimethylolpropane, 1,1 , 1-tris [2- {2- (meth) acryloyloxyethoxy} ethoxy] propane, 1,3,5-tris [2- (meth) acryloyloxyethyl] isocyanurate and the like, Multifunctional (meth) acrylate monomers.

In addition, a (meth) acrylate oligomer is a urethane (meth) acrylate oligomer, polyester (meth) acrylate oligomer, epoxy (meth) acrylate oligomer, etc., for example.

A urethane (meth) acrylate oligomer means the compound which has at least two (meth) acryloyloxy groups in a molecule | numerator, and has a urethane bond (-NHCOO-). The urethane (meth) acrylate oligomer may be, for example, a urethanization reaction product of a hydroxyl group-containing (meth) acrylate monomer having at least one (meth) acryloyloxy group and one hydroxyl group in a molecule and a polyisocyanate. The urethane (meth) acrylate oligomer contains, for example, a terminal isocyanate group-containing urethane compound obtained by reacting polyols with a polyisocyanate, and a hydroxyl group each having at least one (meth) acryloyloxy group and one hydroxyl group in the molecule ( The urethanation reaction product with a meth) acrylate monomer may be sufficient.

The specific example of the hydroxyl group containing (meth) acrylate monomer used for the said urethanation reaction is 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.

The specific example of the polyisocyanate provided for the urethanation reaction with a hydroxyl-containing (meth) acrylate monomer is as follows.

Hexamethylene diisocyanate,

Lysine diisocyanate,

Isophorone diisocyanate,

Dicyclohexyl methane diisocyanate,

Tolylene diisocyanate,

Xylylene diisocyanate,

Compounds obtained by hydrogenating aromatic diisocyanates such as hydrogenated tolylene diisocyanate, hydrogenated xylylene diisocyanate,

Triphenylmethanetriisocyanate,

Dibenzylbenzenetriisocyanate,

Polyisocyanate etc. which are obtained by multiplying diisocyanate among these.

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

Polyester polyol is a compound obtained by dehydrating condensation reaction of polybasic carboxylic acid or its anhydride with said polyol. Specific examples of the polybasic carboxylic acid and its anhydride include (anhydride) succinic acid, adipic acid, (anhydride) maleic acid, (anhydrous) itaconic acid, (anhydrous) trimellitic acid, (anhydrous) pyromellitic acid, hexahydro (Anhydrous) phthalic acid, (anhydride) 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 above-described polyols or bisphenols.

The polyester (meth) acrylate oligomer means a compound having at least two (meth) acryloyloxy groups in a molecule and having an ester bond. Polyester (meth) acrylate oligomer can be obtained by the dehydration condensation reaction of (meth) acrylic acid, polybasic carboxylic acid or its anhydride, and a polyol. Specific examples of the polybasic carboxylic acid or anhydride thereof used in the dehydration condensation reaction include (anhydride) succinic acid, adipic acid, (anhydrous) maleic acid, (anhydrous) itaconic acid, (anhydrous) trimellitic acid, and (anhydrous) Pyromellitic acid, hexahydro (anhydrous) phthalic acid, (anhydrous) phthalic acid, isophthalic acid, terephthalic acid and the like. It does not need to be an anhydride of polybasic carboxylic acid. Specific examples of the polyol 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.

An 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 a molecule | numerator. Specific examples of the polyglycidyl ether used for this addition reaction include ethylene glycol diglycidyl ether, propylene glycol diglycidyl ether, tripropylene glycol diglycidyl ether, and 1,6-hexanediol diglycid. Dimethyl ether, bisphenol A diglycidyl ether, and the like.

Among the above-mentioned (meth) acrylic compounds, at least one kind of the (meth) acrylic compound represented by the following formulas (I) to (IV) is particularly preferable from the viewpoint of excellent adhesion and elastic modulus.

In the 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 may have 1 to 10 carbon atoms, but in general, about 1 to 6 carbon atoms are sufficient. In formula (II), Q is hydrogen or a C1-C10 hydrocarbon group, and this hydrocarbon group may be linear or branched, and may be an alkyl group typically. In this case, carbon number of the alkyl group is also sufficient as 1-6.

In Formula (III), R ₁ , R _2, and R ₃ independently represent a (meth) acryloyloxy group, and in Formula (IV), R represents a hydroxyl group or (meth) acryloyl jade. Indicate the time.

The compound represented by Formula (I) is a di (meth) acrylate derivative of hydrogenated dicyclopentadiene or tricyclodecanedialkanol. Specific examples of the compound represented by formula (I) include hydrogenated dicyclopentadienyl di (meth) acrylate [In formula (I), both of Q ₁ and Q ₂ are the same (meth) acryloyloxy group. Phosphorus compound] and tricyclodecane dimethanol di (meth) acrylate [the compound which is both the same (meth) acryloyloxymethyl group in Q <_1> and Q <_2> in Formula (I)].

The compound represented by formula (II) is a di (meth) acrylate derivative of dioxane glycol or dioxane dialkanol. As a specific example of a compound represented by Formula (II), 1, 3- dioxane-2, 5- diyl di (meth) acrylate [alias: dioxane glycol di (meth) acrylate, in formula (II), A compound in which both Q ₁ and Q ₂ are the same (meth) acryloyloxy group and Q and H are the same], and an acetal compound of hydroxypivalaldehyde and trimethylolpropane [chemical name: 2- (2-hydroxy-1 In the di (meth) acrylate [formula (II) of 1,3-dimethylethyl) -5-ethyl-5-hydroxymethyl-1,3-dioxane], Q ₁ is a (meth) acryloyloxymethyl group , Q ₂ is a 2- (meth) acryloyloxy-1,1-dimethylethyl group, and Q is an ethyl group].

The compound represented by Formula (III) is triacrylate or trimethacrylate of 1,3,5-tris (2-hydroxyethyl) isocyanurate. In addition, the compound represented by Formula (IV) is tri- or tetra- (meth) acrylate of pentaerythritol, and the specific example is pentaerythritol tri (meth) acrylate and pentaerythritol tetra (meth) acrylate. .

It is preferable to use a (meth) acrylic compound together with an epoxy compound at least. The content of the (meth) acrylic compound may be 70% by weight or less, preferably 35 to 70% by weight, particularly preferably 40 to 60% by weight, based on the total amount of the active energy ray-curable compound. When content of the (meth) acrylic-type compound in an active energy ray curable compound exceeds 70 weight%, there exists a tendency for adhesiveness with the polarizer 7 to fall.

(Polymerization Initiator 2: Optical Radical Polymerization Initiator)

When an active energy ray curable compound contains radically polymerizable compounds like the (meth) acrylic compound, it is preferable to mix | blend an optical radical polymerization initiator as a polymerization initiator. The radical photopolymerization initiator is not particularly limited as long as curing of the radically polymerizable compound can be initiated by irradiation of an active energy ray, and a conventionally known one can be used. Specific examples of the radical photopolymerization initiator include acetophenone, 3-methylacetophenone, benzyl dimethyl ketal, 1- (4-isopropylphenyl) -2-hydroxy-2-methylpropan-1-one, and 2-methyl- Acetophenone-based initiators such as 1- [4- (methylthio) phenyl] -2-morpholinopropane-1-one and 2-hydroxy-2-methyl-1-phenylpropan-1-one; Benzophenone-based initiators such as benzophenone, 4-chlorobenzophenone and 4,4'-diaminobenzophenone; Benzoin ether-based initiators such as benzoin propyl ether and benzoin ethyl ether; Thioxanthone initiators such as 4-isopropyl thioxanthone; In addition, xanthone, fluorenone, camphor quinone, benzaldehyde, anthraquinone and the like.

The compounding quantity of the radical photopolymerization initiator may be 0.5 to 20 parts by weight, preferably 10 parts by weight or less, and more preferably 1 to 6 parts by weight with respect to 100 parts by weight of a radically polymerizable compound such as a (meth) acrylic compound. . When there is little quantity of radical photopolymerization initiator, hardening becomes inadequate and there exists a tendency for the mechanical strength and adhesiveness of the resin layer 9 and the polarizer 7 to fall. On the other hand, when there is too much quantity of a radical photopolymerization initiator, the quantity of the active energy ray curable compound in curable resin composition will become comparatively small, and there exists a possibility that the durability performance of the resin layer 9 may fall.

Curable resin composition can contain a photosensitizer further as needed. By using a photosensitizer, the reactivity of cationic polymerization and / or radical polymerization can be improved, and the mechanical strength of the resin layer 9 and the adhesiveness of the resin layer 9 and the polarizer 7 can be improved. The photosensitizer is, for example, a carbonyl compound, an organic sulfur compound, a persulfide, a redox compound, an azo compound, a diazo compound, a halogen compound, a photoreducing dye, and the like. Photosensitizers include benzoin derivatives such as benzoin methyl ether, benzoin isopropyl ether and α, α-dimethoxy-α-phenylacetophenone; Benzophenone derivatives such as benzophenone, 2,4-dichlorobenzophenone, methyl o-benzoylbenzoate, 4,4'-bis (dimethylamino) benzophenone and 4,4'-bis (diethylamino) benzophenone; Thioxanthone derivatives such as 2-chlorothioxanthone and 2-isopropyl thioxanthone; Anthraquinone derivatives such as 2-chloroanthraquinone and 2-methylanthraquinone; Acridon derivatives such as N-methylacridone and N-butylacridone; In addition, (alpha), (alpha)-diethoxy acetophenone, benzyl, fluorenone, xanthone, a uranil compound, etc. These photosensitizers may be used independently, respectively, and may mix and use 2 or more types of photosensitizers. 0.1-20 weight part of content of a photosensitizer may be sufficient with respect to 100 weight part of whole active energy ray curable compounds.

(Optional component of the curable resin composition)

Moreover, curable resin composition may contain the antistatic agent for giving antistatic performance to a polarizing plate. The antistatic agent is, for example, a cationic surfactant, an anionic surfactant, a nonionic surfactant, an ionic compound having an organic cation other than the cationic surfactant, an ionic compound having an organic anion other than the anionic surfactant, conductive inorganic particles And a conductive polymer may be used. The compounding ratio of these antistatic agents can be suitably determined according to the desired characteristic. The compounding 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.

You may mix | blend the additive normally used for a polymeric material with curable resin composition. For example, primary antioxidants such as phenolic or amine based, sulfur secondary antioxidants, hindered amine light stabilizers (HALS), ultraviolet absorbers such as benzophenone based, benzotriazole based, and benzoate based.

You may mix | blend a leveling agent with curable resin composition. When apply | coating this curable resin composition on the polarizer 7 or a base film, when the wettability to the polarizer 7 and a base film is insufficient, or when the surface property of hardened | cured material is bad, by mixing a leveling agent, these You can improve the problem. The leveling agent may be a silicone leveling agent, a fluorine leveling agent, a polyether leveling agent, an acrylic acid copolymer type leveling agent, or a titanate leveling agent. These leveling agents may be used independently, respectively, and may mix and use two or more types. The blending ratio of the leveling agent may be 0.01 to 1 part by weight, preferably 0.1 to 0.7 part by weight, and more preferably 0.2 to 0.5 part by weight based on 100 parts by weight of the active energy ray curable compound. When there is little compounding quantity of a leveling agent, the wettability and surface improvement effect will not fully be exhibited. On the other hand, when there is too much compounding quantity, the adhesiveness of the polarizer 7 and the resin layer 9 may fall.

Moreover, you may mix | blend microparticles | fine-particles, such as a silica microparticle, with curable resin composition. By mix | blending microparticles | fine-particles, especially a silica microparticle, the hardness and mechanical strength of the resin layer 9 obtained can be improved more. Silica microparticles | fine-particles can be mix | blended with curable resin composition as a liquid substance disperse | distributed to the organic solvent, for example. When using the silica fine particles dispersed in the organic solvent, the silica concentration in the organic solvent may be, for example, about 20 to 40% by weight.

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

The blending ratio of the silica fine particles may be 5 to 250 parts by weight, preferably 10 to 100 parts by weight based on 100 parts by weight of the active energy ray curable compound. When the compounding quantity of microparticles | fine-particles is small, the hardness improvement effect of the resin layer 9 by the addition is hard to fully exhibit. On the other hand, when there are too many compounding quantities of microparticles | fine-particles, the adhesiveness of the polarizer 7 and the resin layer 9 may fall, and also the dispersion stability of the microparticles | fine-particles in curable resin composition may be reduced, or of the curable resin composition The viscosity may be excessively increased.

Curable resin composition may contain a solvent as needed. A solvent is suitably selected according to the solubility of the component which comprises curable resin composition. The solvent includes aliphatic hydrocarbons such as n-hexane and cyclohexane; Aromatic hydrocarbons such as toluene and xylene; Alcohols such as methanol, ethanol, propanol, isopropanol and butanol; Ketones such as acetone, methyl ethyl ketone, methyl isobutyl ketone and cyclohexanone; 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; The compounding ratio of a solvent is suitably determined from a viewpoint of viscosity adjustment by the processing objectives, such as film-forming property.

The polarizer 7 may be a film-type polyvinyl alcohol-based resin (PVA film) produced by a process such as stretching, dyeing and crosslinking. The detail of the polarizer 7 is as follows.

For example, first, a PVA film is stretched in the uniaxial direction or the biaxial direction. The dichroic ratio of the polarizer 7 extended in the uniaxial direction tends to be high. Following stretching, the dyeing solution is used to dye the PVA film with iodine, dichroic dye (polyiodine) or organic dye. The dyeing solution may contain boric acid, zinc sulfate, or zinc chloride. You may wash with water a PVA film before dyeing. By washing with water, dirt and an antiblocking agent are removed from the surface of a PVA film. Moreover, as a result of swelling of the PVA film by washing with water, unevenness (uniform dyeing) of dyeing is easily suppressed. The PVA film after dyeing 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. Polyvinyl alcohol-type resin is obtained by saponifying polyvinyl acetate type resin. Polyvinyl acetate type resin may be polyvinyl acetate which is a homopolymer of vinyl acetate, or the copolymer (for example, ethylene-vinyl acetate copolymer) of vinyl acetate and another monomer may be sufficient as it. The other monomer copolymerized with vinyl acetate may be unsaturated carboxylic acids, olefins, vinyl ethers, unsaturated sulfonic acids, or acrylamides having an ammonium group in addition to ethylene. The polyvinyl alcohol-based resin may be modified with aldehydes. The modified polyvinyl alcohol-based resin may be, for example, partially formalized polyvinyl alcohol, polyvinyl acetal, or polyvinyl butyral. The polyvinyl alcohol-based resin may be a polyene-based alignment film such as a dehydrated product of polyvinyl alcohol or a dehydrochloric acid treated product of polyvinyl chloride. You may dye before extending | stretching, and you may extend | stretch in a dyeing liquid. The length of the stretched polarizer 7 may be 3 to 7 times the length before stretching, for example.

The thickness of the polarizer 7 may be 50 µm or less, 30 µm or less, 15 µm or less, 10 µm or less, or 8 µm or less, for example. As the polarizer 7 is thinner, the shrinkage 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 the crack in the polarizer 7 is easily suppressed. In addition, 1 micrometer or more may be sufficient as the thickness of the polarizer 7 from a viewpoint of the handleability of the film (polarizer 7), and 4 micrometers or more may be sufficient as it.

The first protective film 5 may be a thermoplastic resin having light transmittance, and may be an optically transparent thermoplastic resin. Resin which comprises the 1st protective film 5 is chain polyolefin type resin, cyclic olefin polymer type resin (COP type resin), cellulose ester type resin, polyester type resin, polycarbonate type resin, (meth) acrylic type, for example. Resin, polystyrene resin, or a mixture or copolymer thereof may be sufficient.

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

The cyclic olefin polymer resin (cyclic polyolefin resin) may be, for example, a ring-opening (co) polymer of a cyclic olefin or an addition polymer of a cyclic olefin. The cyclic olefin polymer 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, norbornene-based resin using a norbornene-based monomer such as norbornene or a polycyclic norbornene-based monomer.

The cellulose ester resin may be, for example, cellulose triacetate (triacetyl cellulose (TAC)), cellulose diacetate, cellulose tripropionate or cellulose dipropionate. You may use these copolymers. You may use the cellulose-ester type resin in which one part of hydroxyl groups was modified by the other substituent.

You may use polyester-type resin other than cellulose-ester type resin. The polyester resin may be, for example, a polycondensate of a polyhydric carboxylic acid or a derivative thereof and a polyhydric alcohol. Dicarboxylic acid or its derivative (s) may be polyhydric carboxylic acid or its derivative (s). The polyhydric carboxylic acid or derivatives thereof may be, for example, terephthalic acid, isophthalic acid, dimethyl terephthalate, or dimethyl naphthalenedicarboxylic acid. The polyhydric alcohol may be, for example, diol. The polyhydric alcohol may be, for example, ethylene glycol, propanediol, butanediol, neopentylglycol, or cyclohexanedimethanol.

The polyester-based resin is, for example, polyethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate, polybutylene naphthalate, polytrimethylene terephthalate, polytrimethylenenaphthalate, polycyclohexanedimethylterephthalate, or polycyclohexane Dimethyl naphthalate may be sufficient.

Polycarbonate resin is a polymer in which a polymerization unit (monomer) is bonded via a carbonate group. The polycarbonate resin may be a modified polycarbonate having a modified polymer skeleton or may be a copolymerized polycarbonate.

Examples of the (meth) acrylic resins include poly (meth) acrylic acid esters (eg, polymethyl methacrylate (PMMA)); Methyl methacrylate- (meth) acrylic acid copolymer; Methyl methacrylate- (meth) acrylic acid ester copolymer; Methyl methacrylate-acrylic acid ester- (meth) acrylic acid copolymer; Methyl (meth) acrylate-styrene copolymers (eg, MS resin); A copolymer of methyl methacrylate with a compound having an alicyclic hydrocarbon group (for example, methyl methacrylate-cyclohexyl copolymer, methyl methacrylate-norbornyl copolymer, etc.) may be used.

The 1st protective film 5 may also contain the at least 1 sort (s) of additive chosen from the group which consists of a lubricating agent, a plasticizer, a dispersing agent, a heat stabilizer, a ultraviolet absorber, an infrared absorber, an antistatic agent, and antioxidant.

The thickness of the 1st protective film 5 may be 5 micrometers or more and 90 micrometers or less, 5 micrometers or more and 80 micrometers or less, or 5 micrometers or more and 50 micrometers or less, for example.

The thickness of the resin layer 9 may be, for example, 0.5 µm or more and 20 µm or less, 1 µm or more and 10 µm or less, or 1 µm or more and 5 µm or less. When the thickness of the resin layer 9 is more than the said lower limit, the movement of the dichroic dye from the polarizer 7 to another layer (for example, the adhesion layer 11) can be suppressed effectively. When the thickness of the resin layer 9 is below the said upper limit, the curable composition can be fully hardened.

The first protective film 5 may be a film having an optical function, such as a retardation film or a brightness enhancing film. For example, the retardation film to which arbitrary phase difference value was provided is obtained by extending | stretching the film which consists of said thermoplastic resins, or forming a liquid crystal layer etc. on the said film.

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

Active energy ray curable resin is resin which hardens | cures by irradiating an active energy ray. The active energy ray may be, for example, ultraviolet rays, visible light, electron beams or X-rays. The active energy ray curable resin may be an ultraviolet curable resin.

1 type of resin may be sufficient as active energy ray curable resin, and may contain multiple types of resin. For example, active energy ray curable resin may contain a cationically polymerizable curable compound or a radically polymerizable curable compound. Active-energy-ray-curable resin may also contain the cationic polymerization initiator or radical polymerization initiator for starting hardening reaction of the said curable compound.

The cationically polymerizable curable compound may be, for example, an epoxy compound (a compound having at least one epoxy group in a molecule) or an oxetane compound (a compound having at least one oxetane ring in a molecule). The radically polymerizable curable compound may be, for example, a (meth) acrylic compound (a compound having at least one (meth) acryloyloxy group in a molecule). The radically polymerizable curable compound may be a vinyl compound having a radically 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, an antifoaming agent, an antistatic agent, a leveling agent, a solvent, or the like, as necessary. It may include.

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

Resin which comprises the 2nd protective film 3 may be the same as the above-mentioned resin enumerated as resin which comprises the 1st protective film 5. The thickness of the 2nd protective film 3 may be 5 micrometers or more and 200 micrometers or less, for example.

Resin which comprises the release film 13 may be the same as the above-mentioned resin enumerated as resin which comprises the 1st protective film 5. The thickness of the release film 13 may be 5 micrometers or more and 200 micrometers or less, for example.

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 shown in FIG. 3, the liquid crystal display device 30A according to the first embodiment includes a polarizing plate overlapping the liquid crystal cell 10 and one surface (first surface) of the liquid crystal cell 10. 1Aa) (1st polarizing plate) is provided. 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 2nd protective film 3 are not provided. The polarizing plate 1Aa (first polarizing plate) is adhered to the first surface of the liquid crystal cell 10 via the adhesive layer 11. The polarizing plate 1Aa (front side polarizing plate) has the adhesion layer 11 which overlaps with the 1st surface of the liquid crystal cell 10, the resin layer 9 which overlaps with the adhesion layer 11, and the resin layer 9 It has the polarizer 7 superimposed on and the 1st protective film 5 superimposed on the polarizer 7. Another polarizing plate (rear side polarizing plate) may be bonded to the second surface of the liquid crystal cell 10. The liquid crystal cell 10, the polarizing plate 1Aa (front side polarizing plate), and the other 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 other members of the backlight are omitted in FIG. 3.

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 suppresses chemical damage to the liquid crystal cell 10. do. This is because, when the iodine in the polarizer 7 is deposited on the surface of the resin layer 9 side of the polarizer 7, movement of the iodine to the liquid crystal cell 10 is suppressed by the resin layer 9.

Second Embodiment

Below, 2nd Embodiment of this invention is described. Below, the matter (distance of 1st Embodiment and 2nd Embodiment) intrinsic to 2nd Embodiment is demonstrated. In the matter which is not described below, the second embodiment is common to the first embodiment.

In 2nd Embodiment, the hole which penetrates a polarizer is formed instead of the recessed notch. For example, as shown in FIG. 6, the polarizing plate 1B includes a film polarizer 7, a resin layer 9, a first protective film 5, a second protective film 3, and an adhesive layer 11. ) And the release film 13, the hole (through hole 21) which penetrates the whole polarizing plate 1B is formed in the 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 lamination 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. 6. 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 square or a triangle, or may be elliptical.

The resin layer 9 is superposed on the entire surface of one of the polarizers 7 and is in close contact with the entire surface of one of the polarizers 7. The adhesion layer 11 is superposed on the whole surface of the resin layer 9, and is firmly in contact with the whole surface of the resin layer 9. The release film 13 has covered the whole surface of the adhesion layer 11. The 1st protective film 5 is overlapped with the whole other surface of the polarizer 7, and is adhere | attached on the whole other surface of the polarizer 7. The second protective film 3 covers the entire surface of the first protective film 5.

Since the direction of the end face of the polarizer 7 exposed inside the through hole 21 is not constant or the same as the absorption axis of the polarizer 7, when the polarizer 7 shrinks with temperature change, The through hole 21 does not shrink equally. As a result, a stress tends to occur at a local portion of the end face of the polarizer 7 exposed inside the through hole 21. Due to this stress, cracks starting from the inside of the through hole 21 are likely to be formed along the absorption axis of the polarizer 7. In addition, the crack of the polarizer 7 in the through hole 21 also originates in the process for forming the through hole 21. FIG. In the process of forming the through-hole 21 in the polarizing plate 1B, a load is easy to be applied to the laminated body which comprises the polarizing plate 1B, especially the polarizer 7. Due to the load at the time of processing, minute scratches are likely to occur at the end of the polarizer 7 exposed inside the through hole 21. This minute wound tends to be a starting point of the crack at the time of thermal contraction of the polarizer 7. However, since the resin layer 9 is in close contact with the polarizer 7, cracks in the polarizer 7 in the through hole 21 due to the temperature change are 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. Moreover, since the polarizing plate 1B is equipped with the resin layer 9, the light leakage (white spot) and thermal nonuniformity in the polarizing plate 1B (especially around the through hole 21) are suppressed.

The formation method of the through hole 21 is not limited. In the above-described 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 laminate 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 a laser onto the surface of the second laminate. For example, the through hole 21 may be formed in the second laminate by processing using a CO ₂ laser or the like (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, the 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 concave notches and through holes may be formed in the polarizer and the polarizing plate. The recessed notch may be formed only in the polarizer. A hole penetrating only the polarizer may be formed.

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

For example, the polarizer may be sandwiched between a pair of resin layers containing a cured resin. That is, the 1st resin layer containing hardened | cured resin may overlap on the 1st surface of the polarizer, and the 1st resin layer may be in close contact with the 1st surface of the polarizer, and the 2nd resin layer containing hardened | cured resin may be a polarizer. It may overlap with the 2nd surface (back surface) of, and a 2nd resin layer may adhere to the 2nd surface of a polarizer.

The resin layer containing the cured resin may be superposed on the first surface of the polarizer, the resin layer may be in close contact with the first surface of the polarizer, and the adhesive layer may be superimposed on the second surface of the polarizer, and the adhesive layer may be It may be in close contact with the second surface.

The polarizing plate 1A or the polarizing plate 1B may not include one or both of the second protective film 3 and the release film 13. For example, in the manufacturing process of an image display apparatus, the 2nd protective film 3 may peel from the polarizing plate 1A or the polarizing plate 1B, and may remove it. That is, the temporary protective film may be sufficient as the 2nd protective film 3. The release film 13 may also be peeled from the polarizing plate 1A and removed in the manufacturing process of the image display device.

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

The optical film which a polarizing plate is equipped with is a reflective polarizing film, an anti-glare film, the film with a surface reflection prevention function, a reflective film, a semi-transmissive reflective film, a viewing angle compensation film, an optical compensation layer, a touch sensor layer, an antistatic layer, or It may be an antifouling layer.

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

A hard coat layer is a layer which consists of an acrylic resin film in which the fine uneven | corrugated shape was formed in the surface, for example. The hard coat layer may be formed of, for example, a coating film containing organic fine particles or inorganic fine particles. You may use the method (for example, the embossing method etc.) which sticks this coating film to the roll which has an uneven shape. After forming the coating film which does not contain an organic fine particle or an inorganic fine particle, you may use the method of sticking this coating film to the roll which has an uneven shape. 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, or 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 polymethylmethacrylate particles, silicone resin particles, polyimide particles, or the like. . What is necessary is just to select the binder component for disperse | distributing an inorganic fine particle or organic fine particle from the material used as a 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 a viewpoint of productivity, hardness, etc., as a binder component, ultraviolet curable resin is used preferably. The thickness of the hard coat layer may be, for example, 2 µm or more and 30 µm or less, or 3 µm or more and 30 µm or less.

The shape of each of a polarizing plate and a notch may be various forms according to a use. For example, as shown in (a) of FIG. 4, the shape of the notch 7C may be a semicircle. As shown in (b) of FIG. 4, the shape of the notch 7C may be triangular. The shape of the notch 7C may be a polygon other than a rectangle and a triangle. As shown in (c) in FIG. 4, the outer edges (first end 7e and second end 17e) of the polarizer 7 may be circular. As shown to (d) in FIG. 4, the chamfered part 7C3 and the chamfer 7C4 may be formed in the core part (corner part) of the notch 7C. The corner portions 7C1 and the corner portions 7C2 located at both ends of the notched portion 7C may also be chamfered. An outer corner CR1, an outer corner CR2, an outer corner CR3, and an outer corner CR4 positioned at the outer edge of the polarizer 7 may also be chamfered. Said chamfering is possible, for example by cutting and grinding of the notch part and outer edge which used the end mill. The shape of each polarizer 7 shown to (a) in FIG. 4, (b) in FIG. 4, (c) in FIG. 4, and (d) in FIG. 4 is the shape of the polarizing plate provided with each polarizer 7, respectively. You may consider it a shape. In other words, the shape of the notch 7C formed in each polarizer 7 shown to (a) in FIG. 4, (b) in FIG. 4, (c) in FIG. 4, and (d) in FIG. You may consider it the shape of the notch part formed in the polarizing plate provided with the polarizer 7. As shown in (d) in FIG. 4, the crack in the notch 7C is easily suppressed by the chamfering of the notch 7C. The chamfer 7C3 and the chamfer 7C4 shown in (d) of FIG. 4 may be replaced with the curved core part (corner part) of a notch. The larger the radius of curvature of the curved core portion (corner) of the notch 7C, the more easily the crack in the notch 7C is suppressed. For example, when the radius of curvature of the curved core (corner) of the notch 7C is 0.07 mm or more, the crack in the notch 7C is easily suppressed. The radius of curvature of the curved core (corner) of the notch 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. What is necessary is just 10 mm or less.

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

Moreover, according to this invention, it is also possible to suppress light leakage in the notch 7C or the periphery of the through-hole 21. FIG. For example, when the polarizing plate 1A or 1B is mounted on the 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 liquid crystal cell through the adhesive layer 11. Bonded to the surface. When the liquid crystal display device operates, the polarizer 7 contracts greatly in the absorption axis direction due to heat generated in the liquid crystal display device (for example, heat due to the backlight). If instead of the resin layer 9, when the protective film is directly superposed on the surface of the polarizer 7, a large amount of heat shrinkage of the polarizer 7 causes deformation of the protective film itself, resulting in a phase difference. In the part where phase difference generate | occur | produced, light leaks and a spot is seen in the part which phase difference generate | occur | produced. 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 be concentrated around the cutout portion 7C or the through hole 21, and light leakage tends to occur around the cutout portion 7C or the through hole 21. The retardation described above depends on the thickness or photoelastic coefficient of each layer at the point where the phase difference occurs. For example, with the increase of the thickness of a protective film and also the increase of the photoelastic coefficient of a protective film, phase difference tends to generate | occur | produce. Therefore, the resin layer 9 (for example, the resin layer 9 whose thickness is 0.5-10 micrometers) which is thinner than the conventional protective film and is small is arrange | positioned between the polarizer 7 and a liquid crystal cell, Light leakage in the periphery of the connection part 7C or the through-hole 21 can be suppressed. The above effects can be confirmed, for example, by a durability test (particularly, heat resistance test under high temperature) using the polarizing plate 1A or 1B.

Example

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

(Example 1)

The rectangular 1st laminated body comprised from the polarizer film (polarizer 7 before cutting), the resin layer 9, three optical films 3, 5, 13, and the pressure-sensitive adhesive layer 11 Produced. The 1st laminated body is the release film 13, the adhesion layer 11 which overlaps with the whole release film 13, the resin layer 9 which overlaps with the whole adhesion layer 11, and the resin layer 9 The polarizer film 7 which overlaps the whole, the 1st protective film 5 which overlaps with the whole polarizer film 7, and the 2nd protective film 3 which overlaps with the whole 1st protective film 5 are provided, there was. As the polarizer film 7, polyvinyl alcohol of stretched and dyed film type was used.

The resin layer 9 was produced in the following procedures. As the uncured ultraviolet curable resin, two epoxy compounds (compounds A and B below), one oxetane compound (compound C below), and a photocationic polymerization initiator (compound D below) are described below. The mixture was prepared by mixing in the compounding ratio of. This mixture was applied to the surface of the PET substrate to form an uncured layer (a precursor of the resin layer 9). The polarizer film 7, the 1st protective film 5, and the 2nd protective film 3 were laminated | stacked in this order, and the laminated body was formed. 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, ultraviolet (UVB) was irradiated to the uncured layer. The illuminance of the ultraviolet ray was adjusted to 400 mJ / cm 2. After irradiating an ultraviolet-ray, the PET base material was peeled from the resin layer 9, and the resin layer 9 superposed on the whole surface of the polarizer film 7 and firmly stuck to the whole surface of the polarizer was obtained.

<Each compound contained in uncured ultraviolet curable resin and its compounding ratio>

Compound A: 3 ', 4'-epoxycyclohexylmethyl 3,4-epoxycyclohexanecarboxylate ("Celoxide 2021P" manufactured by Daicel Co., Ltd.)

Compounding ratio of compound A: 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 Printech Co., Ltd.)

Compounding ratio of compound B: 15 parts by mass

Compound C: bis (3-ethyl-3-oxetanylmethyl) ether ("Aron Oxetane OXT-221" manufactured by Toagosei Co., Ltd.)

Compounding ratio of compound C: 50 parts by mass

Compound D: Triphenylsulfonium Hexafluorophosphate

Compounding ratio of compound D: 2.25 parts by mass

As the 1st protective film 5, the 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 1st protective film 5 was adhere | attached to the polarizer film 7 via the water-based adhesive agent. As the second protective film 3, a PET protect film was used. As the release film 13, PET separator was used. The thickness of the release film 13 was 38 micrometers. The thickness of the adhesion layer 11 was 20 micrometers. The thickness of the resin layer 9 was 3 micrometers. The thickness of the polarizer 7 was 7 micrometers. The thickness of the whole 1st protective film 5 containing a hard-coat layer was 32 micrometers. The thickness of the 2nd protective film 3 was 58 micrometers. The thickness of the water-based adhesive agent was 50 nm.

The said 1st laminated body was cut out with the cutter, and the 2nd laminated body of a smaller rectangular shape was produced. The second laminate was fixed to the stage by adsorption. By irradiation of CO ₂ laser on the outer edge of the fixed second laminate, to form a first cut-away portion of the negative type to the roadside (first end) of the second laminate. When forming a notch, the core (inside) 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 20 W. The oscillation wavelength of the CO ₂ laser was 10.4 μm.

The shape of the obtained polarizing plate was the same as that of the polarizer 7 shown in FIG. That is, the polarizer 7 shown in FIG. 5 is a polarizer with which the polarizing plate produced by the said procedure is equipped. The core part (inside) of the notch 7C formed in the 1st edge part 7e (horizontal side of a 2nd laminated body) of the polarizer 7 was a semicircle. The radius of curvature R of the core portion of the notched portion 7C was 2 mm. The width W _C of the notch 7C in the direction parallel to the first end 7e was twice the radius of curvature R, that is, 4 mm. The depth D _C of the notch 7C in the direction perpendicular to the first end 7e was 10 mm. The width W of the whole 1st edge part 7e of the polarizer 7 in which the notch 7C was formed was 60 mm. That is, the length (width of the polarizing plate) of the horizontal side of the polarizing plate was 60 mm. The length D (vertical width of a polarizing plate) of the vertical side of a polarizing plate was 70 mm.

The release film 13 was peeled from the adhesion layer 11 of the polarizing plate, and the polarizing plate was bonded to the glass plate through the adhesion layer 11. In addition, the 2nd protective film 3 was peeled from the polarizing plate. By this procedure, the sample which consists of a glass plate and the polarizing plate bonded to the glass plate was prepared. The heat cycle test was done using this sample. In the heat cycle test, the cycle consisting of the following Step 1 and Step 2 following Step 1 was repeated.

Step 1: The sample is heated for 30 minutes in an atmosphere of 85 ° C.

Step 2: Cool the sample for 30 minutes in the atmosphere of -40 ℃.

At each time point in which the said cycle was repeated the predetermined number of times shown in following Table 1, the notch 7C formed in the polarizer 7 with which a sample was equipped was observed with the optical microscope.

<Measurement of Absorbance Rising Rate of Resin Layer 9>

The coating film was formed by apply | coating the above-mentioned uncured ultraviolet curable resin to one side of a cycloolefin type film with a bar coater. As a cycloolefin type film, "ZEONOR" by Nippon Xeon Co., Ltd. was used. The thickness of the cycloolefin type film was 50 micrometers. Another cycloolefin type film was bonded to the coating film, and the laminated body was produced. By irradiating the surface of a laminated body (namely, the surface of a cycloolefin type film), the coating film sandwiched by a pair of cycloolefin type film was hardened and the resin layer 9 'was formed. The composition of the resin layer 9 'was the same as the composition of the resin layer 9 mentioned above. The accumulated light amount of ultraviolet rays in the range of 280 nm to 320 nm was 1000 mJ / cm 2. The ultraviolet irradiation device which has a belt conveyor was used for irradiation of an ultraviolet-ray. As a light source (lamp) of an ultraviolet-ray, "D bulb" by a fusion UV system company was used. The cycloolefin type film was peeled off from both surfaces of the resin layer 9 '. The thickness of the resin layer 9 'was about 30 micrometers. The absorbance (Absi and Absf) of the resin layer 9 'was measured, respectively. For the measurement of Absi and Absf, an ultraviolet visible spectrophotometer (UV2450) manufactured by Shimadzu Corporation was used. From Absi and Absf, the absorbance increase rate of the resin layer 9 'was calculated. The absorbance increase rate of the resin layer 9 'was 3%.

Measurement of Polarization

The polarizing plate of Example 1 was cut out, and the dimension of the polarizing plate was adjusted to 30 mm x 30 mm. Then, the release film 13 was peeled from the adhesion layer 11 of the polarizing plate. And the polarizing plate was bonded to the glass plate through the adhesion layer 11. In addition, the 2nd protective film 3 was peeled from the polarizing plate. As a glass plate, the alkali free glass "EAGLE XG" by a Corning company was used. The sample produced in 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 1 hour of autoclave treatment, the sample was allowed to stand for 24 hours in an environment of a temperature of 23 ° C. and a relative humidity of 55%. Then, the "film holder with polarizing film" of an optional accessory was set to the ultraviolet visible spectrophotometer. As an ultraviolet visible spectrophotometer, "UV2450" by Shimadzu Corporation was used. The transmission spectrum of the transmission axis direction of the polarizing plate in the range of wavelength 380-700 nm was measured using this ultraviolet visible spectrophotometer. Similarly, the transmission spectrum of 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 calculated | required. Then, the sample was left to stand for 24 hours in the environment of 80 degreeC and 90% of a relative humidity. Finally, the polarization degree Pyf (unit:%) of the terminal of the polarizing plate was calculated | required in the same way as Pyi. The change (ΔPy) (that is, Pyf-Pyi) of the degree of polarization 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 via the water-based adhesive agent. As a 3rd protective film, the film comprised from cyclic olefin polymer type resin (COP type resin) was used. The thickness of the water-based adhesive agent was 50 nm. The thickness of the 3rd protective film was 13 micrometers. The thickness of the polarizer film 7 used by the comparative example 1 was 12 micrometers.

The polarizing plate of the comparative example 1 is the release film 13, the adhesion layer 11 which overlaps with the whole release film 13, the 3rd protective film which overlaps with the whole adhesion layer 11, and the whole 3rd protective film. It was provided with the polarizer 7 which overlaps with, the 1st protective film 5 which overlaps with the whole polarizer 7, and the 2nd protective film 3 which overlaps with the whole 1st protective film 5. As shown in FIG.

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

(Comparative Example 2)

The thickness of the 3rd protective film used by the comparative example 2 was 23 micrometers.

The polarizing plate of the comparative example 2 was produced by the method similar to the comparative example 1 except the difference of the thickness of a 3rd protective film. The shape of the polarizing plate of Comparative Example 2 was the same as that of the polarizer 7 shown in FIG. 5. As in the case of Example 1, the heat cycle test using the polarizing plate of Comparative Example 2 was performed.

(Comparative Example 3)

In the comparative example 3, the film comprised from acrylic resin was used as a 3rd protective film. The thickness of the 3rd protective film used by the comparative example 3 was 20 micrometers.

The polarizing plate of the comparative example 3 was produced by the method similar to the comparative example 1 except the difference of the composition and thickness of a 3rd protective film. The shape of the polarizing plate of Comparative Example 3 was the same as that of the polarizer 7 shown in FIG. 5. As in the case of Example 1, the 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 the comparative example 4, instead of the resin layer 9, the 3rd protective film was adhere | attached on one surface of the polarizer film 7 via an aqueous adhesive. As a 3rd protective film, the film comprised from cyclic olefin polymer type resin (COP type resin) was used. The thickness of the 3rd protective film was 13 micrometers. The thickness of the polarizer film 7 used in the comparative example 4 was 7 micrometers. In Comparative Example 4, the first protective film 5 was not used. In the comparative example 4, instead of the 1st protective film 5, the whole other surface of the polarizer film 7 was directly covered by the 2nd adhesion layer. The thickness of the 2nd adhesion layer (adhesion layer different from the adhesive layer 11) was 5 micrometers. In addition, the whole surface of the 2nd adhesion layer was directly covered with the brightness improving film. As the brightness improving film, 3M Japan Corporation APF-V3 was used. The thickness of the brightness improving film was 26 micrometers.

The polarizing plate of the comparative example 4 has the release film 13, the adhesion layer 11 (1st adhesion layer) which overlaps with the whole release film 13, the 3rd protective film which overlaps with the whole adhesion layer 11, and And the polarizer 7 superimposed on the whole 3rd protective film, the 2nd adhesion layer which overlaps with the whole polarizer 7, and the brightness improvement film which overlaps the whole 2nd adhesion layer.

A polarizing plate of Comparative Example 4 was prepared in the same manner as in Example 1 except for the above difference in laminated structure. The shape of the polarizing plate of Comparative Example 4 was the same as that of the polarizer 7 shown in FIG. 5.

In the heat cycle test of the comparative example 4, the polarizing plate bonded to the glass plate is the adhesion layer 11 (1st adhesion layer) which adheres to a glass plate, the 3rd protective film which overlaps the whole adhesion layer 11, and the 3rd The polarizer 7 superimposed on the whole protective film, the 2nd adhesion layer which overlaps with the whole polarizer 7, and the brightness improvement film which overlaps the whole 2nd adhesion layer were provided. The heat cycle test of Comparative Example 4 was conducted in the same manner as in Example 1 except for the laminated structure of the polarizing plate.

The results of the heat cycle tests in each of 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 7C of the polarizer 7. "B" means that the crack whose length is 200 micrometers or less was formed in the notch 7C of the polarizer 7. "C" means that in the notch 7C of the polarizer 7, the crack of 201 micrometer or more and 500 micrometers or less was formed. "D" means that the crack whose length is 501 micrometers or more was formed in the notch 7C of the polarizer 7. "E" means that the crack formed in the notch 7C of the polarizer 7 penetrated the polarizing plate along the surface of the polarizing plate. That is, "E" means that the crack crossed the whole polarizing plate toward the 2nd edge part 17e from the core part of 7 C of notch parts.

(Example 1A)

In Example 1A, the width W (horizontal width of the polarizing plate) of the first end 7e of the polarizer 7 with the cutout 7C was adjusted to 120 mm. The polarizing plate of Example 1A was produced by the method similar to Example 1 except adjusting the width of a polarizing plate. As in the case of Example 1, the heat cycle test using the polarizing plate of Example 1A was done.

(Comparative Example 1A)

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

(Comparative Example 2A)

In Comparative Example 2A, the width W (horizontal width of the polarizing plate) of the first end 7e of the polarizer 7 with the cutout 7C was adjusted to 120 mm. The polarizing plate of Comparative Example 2A was produced in the same manner as in Comparative Example 2 except that the width of the polarizing plate was adjusted. As in the case of Comparative Example 2, a heat cycle test using a polarizing plate of Comparative Example 2A was conducted.

(Comparative Example 3A)

In Comparative Example 3A, the width W (the horizontal width of the polarizing plate) of the first end 7e of the polarizer 7 with the cutout 7C was adjusted to 120 mm. The polarizing plate of Comparative Example 3A was produced in the same manner as in Comparative Example 3 except that the width of the polarizing plate was adjusted. As in the case of Comparative Example 3, a heat cycle test using a polarizing plate of Comparative Example 3A was conducted.

(Comparative Example 4A)

In Comparative Example 4A, the width W (the horizontal width of the polarizing plate) of the first end 7e of the polarizer 7 with the cutout 7C was adjusted to 120 mm. The polarizing plate of Comparative Example 4A was produced in the same manner as in Comparative Example 4 except that the width of the polarizing plate was adjusted. As in the case of Comparative Example 4, a heat cycle test using a polarizing plate of Comparative Example 4A was performed.

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

(Example 1B)

In Example 1B, concave notches were not formed on the lateral edges (first ends) of the second laminate. As shown in FIG. 6, in Example 1B, the circular hole which penetrates the 2nd laminated body was formed in the center part of the surface of a 2nd laminated body. 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 (horizontal 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 matters. As in the case of Example 1, the heat cycle test using the polarizing plate of Example 1B was performed.

(Comparative Example 1B)

In the comparative example 1B, the recessed notch was not formed in the horizontal side (1st edge part) of a 2nd laminated body. As shown in FIG. 6, in the comparative example 1B, the circular hole which penetrates a 2nd laminated body was formed in the center part of the surface of a 2nd laminated body. 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 (width of the polarizing plate) of the first end 7e of the polarizer 7 was adjusted to 120 mm.

Except the above matter, the polarizing plate of the comparative example 1B was produced by the method similar to the comparative example 1. As in the case of Comparative Example 1, a heat cycle test using a polarizing plate of Comparative Example 1B was performed.

(Comparative Example 2B)

In the comparative example 2B, the recessed notch was not formed in the horizontal side (1st edge part) of a 2nd laminated body. As shown in FIG. 6, in the comparative example 2B, the circular hole which penetrates a 2nd laminated body was formed in the center part of the surface of a 2nd laminated body. 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 (width of the polarizing plate) of the first end 7e of the polarizer 7 was adjusted to 120 mm.

Except the above matter, the polarizing plate of the comparative example 2B was produced by the method similar to the comparative example 2. As in the case of Comparative Example 1, a heat cycle test using a polarizing plate of Comparative Example 2B was performed.

(Comparative Example 3B)

In the comparative example 3B, the recessed notch was not formed in the horizontal side (1st edge part) of a 2nd laminated body. As shown in FIG. 6, in the comparative example 3B, the hole which penetrates a 2nd laminated body was formed in the center part of the surface of a 2nd laminated body. 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 (width of the polarizing plate) of the first end 7e of the polarizer 7 was adjusted to 120 mm.

Except the above matter, the polarizing plate of the comparative example 3B was produced by the method similar to the comparative example 3. As in the case of Comparative Example 1, a heat cycle test using a polarizing plate of Comparative Example 3B was conducted.

The result of the heat cycle test of each of Example 1B and Comparative Examples 1B to 3B is shown in Table 3 below.

<Evaluation of Heat Unevenness>

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 are 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 cutout portions 7C extended were parallel. A polarizing plate of Comparative Example 1C ′ similar to Comparative Example 1 was produced except that the angle θ formed between the absorption axis direction da of the polarizer 7 and the direction dc of the cutout portion 7C was 45 °. .

In the same manner as in the heat cycle test described above, a sample of Example 1C was prepared. 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 cross nicol state.

In the same procedure as in Example 1C, the polarizing plates of Comparative Example 1C and Comparative Example 1C 'after heating were observed in a cross nicol state.

As a result of the observation, light leakage (white spot) and thermal nonuniformity existed in the polarizing plates of Comparative Examples 1C and 1C ', respectively. Light leakage (white spot) and thermal nonuniformity are because each polarizing plate does not have the resin layer 9, and large shrinkage stress generate | occur | produced in the extending direction of the polarizer 7 with heating. On the other hand, in each polarizing plate of Example 1C, there was no light leakage (white spot) and heat nonuniformity.

In the same procedure as in Example 1C, the polarizing plates of Example 1B and Comparative Example 1B after heating were observed in a cross nicol state.

As a result of the observation, in the polarizing plate of Comparative Example 1B, there were light leakage (white spot) and thermal nonuniformity. The light leakage (white spot) and thermal nonuniformity are due to the polarizing plate of Comparative Example 1B not having the resin layer 9, and a large shrinkage stress occurred in the stretching direction of the polarizer 7 with heating. On the other hand, in each polarizing plate of Example 1B, there was no light leakage (white spot) and heat nonuniformity.

(Examples 2 to 6)

As described below, the polarizing plates of Examples 2 to 6 were produced 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 of Examples 2-6 differs from the composition of the said mixture used in Example 1.

As a raw material of each resin layer 9 of Examples 2-6, the mixture was prepared with each compound shown in Table 4 below. The compounding ratio (unit: mass part) of each compound in each mixture of Examples 2-6 was adjusted to the value shown in Table 4 below.

"CEL2021P" in the following Table 4 is the same as that of Compound A used in Example 1.

"EHPE3150" of following Table 4 is the 1, 2- epoxy- 4- (2- oxiranyl) cyclohexane addition product of 2, 2-bis (hydroxymethyl) -1- butanol by the Daicel Corporation | Namely an epoxy compound).

"EX-214L" of following Table 4 is 1 type of the Denacol EX-L series by Nagase Chemtex Co., Ltd., and is 1, 4- butanediol diglycidyl ether (that is, an epoxy compound).

"VG3101L" in the following Table 4 is the same as that of Compound B used in Example 1.

"OXT-221" in the following Table 4 is the same as that of the compound C used in Example 1.

"A-DCP" in following Table 4 is the tricyclodecane dimethanol diacrylate (namely, a (meth) acrylic-type compound) by Shin-Nakamura Chemical Co., Ltd. make.

"CPI-100P" in following Table 4 is a photo-acid generator (photocationic polymerization initiator) of the triaryl sulfonium salt type by San Afro Corporation.

"IRGACURE 1173" in the following Table 4 is IGM Resins B.V. It is the former brand name (current brand name: Omnirad 1173) of manufacture, and 2-hydroxy- 2-methyl- 1-phenyl- propane- 1-one (photoinitiator).

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

(Examples 2B, 3B, 4B, 5B, 6B)

The composition of the resin layer 9 of Example 2B was the same as that of the resin layer 9 of Example 2. The composition of the resin layer 9 of Example 3B was the same as that of the resin layer 9 of Example 3. The composition of the resin layer 9 of Example 4B was the same as that of the resin layer 9 of Example 4. The composition of the resin layer 9 of Example 5B was the same as that of the resin layer 9 of Example 5. The composition of the resin layer 9 of Example 6B was the same as that of the resin layer 9 of Example 6.

Except the above, the polarizing plates of Example 2B, 3B, 4B, 5B, and 6B were produced by the method similar to Example 1B. That is, similarly to the polarizing plate of Example 1B, circular through holes were formed in each of the polarizing plates of Example 2B, 3B, 4B, 5B, and 6B.

In the same manner as in the case of Example 1, a heat cycle test using polarizing plates of Examples 2B, 3B, 4B, 5B, and 6B was performed. At each time point after 240 cycles and 500 cycles, the notch 7C of the polarizer 7 in each of Examples 2B, 3B, 4B, 5B, and 6B was free of cracks.

As in the case of Example 1C, the polarizing plates of Examples 2B, 3B, 4B, 5B, and 6B were heated at 85 ° C. for 2 hours, and then the polarizing plates of Examples 2B, 3B, 4B, 5B, and 6B were cross nicoled. Observed at In any of the polarizing plates of Examples 2B, 3B, 4B, 5B, and 6B, there was no light leakage (white spot) and thermal nonuniformity.

(Examples 2C, 3C, 4C, 5C, 6C)

The 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 are parallel.

The 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 are parallel.

The 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.

The 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 are parallel.

The 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 are parallel.

<Evaluation of Heat Unevenness>

As in the case of Example 1C, the polarizing plates of Examples 2C, 3C, 4C, 5C, and 6C were heated at 85 ° C. for 2 hours, and then the polarizing plates of Examples 2C, 3C, 4C, 5C, and 6C were cross nicol. Observed at In any of the polarizing plates of Examples 2C, 3C, 4C, 5C, and 6C, there was no light leakage (white spot) and thermal nonuniformity.

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.

1A, 1Aa, 1B: Polarizing plate 3: 2nd protective film
5: 1st protective film 7: polarizer
7C: notch 7e: end of polarizer (first end)
9: resin layer 10: liquid crystal cell
11: adhesion layer 13: release film
17e: second end of polarizer 20A: liquid crystal panel
30A: Liquid Crystal Display (Image Display) 21: Hole Through Polarizer
da: absorption axis direction of polarizer dc: direction in which the notch extends
θ: angle formed between the absorption axis direction of the polarizer and the direction in which the cutouts extend

Claims (8)

With a film polarizer,
A resin layer containing a cured resin product,
The resin layer is superimposed on the polarizer and in close contact with the polarizer,
The recessed cutout part is formed in the edge part of the said polarizer. With a film polarizer,
A resin layer containing a cured resin product,
The resin layer is superimposed on the polarizer and in close contact with the polarizer,
A polarizing plate is formed through the hole of the polarizer. According to claim 1 or 2, further comprising an adhesive layer,
The said adhesive layer is overlapped with the said resin layer, and the polarizing plate is in close contact with the said resin layer. The polarizing plate of any one of Claims 1-3 in which the said resin hardened | cured material contains an epoxy type compound. The polarizing plate of any one of Claims 1-4 in which the said resin hardened | cured material contains an oxetane type compound. The polarizing plate of any one of Claims 1-5 in which the said resin hardened | cured material contains a (meth) acrylic-type compound. The polarizing plate according to any one of claims 1 to 6, wherein the resin layer is an overcoat layer. The image display apparatus containing the polarizing plate of any one of Claims 1-7.

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