KR20220054320A - A polarizing film laminate, an optical display panel in which the polarizing film laminate is used, a polarizing film laminate with a transparent adhesive layer, and a polarizing film assembly - Google Patents

Abstract

The polarizing film laminate etc. which can solve the problems of polyenization, color loss, and heating redness comprehensively by suppressing the influence by sunlight irradiation are provided. In the Cartesian coordinate system in which the x-axis is the iodine concentration of the polarizing film (wt.%) and the y-axis is the moisture content (g/m2) of the polarizing film laminate, the x-y coordinate point is (6.0, 0.7) a first coordinate point, ( The first line segment connecting the second coordinate point of 1.8, 4.2), the second line segment connecting the second coordinate point, the second line segment connecting the third coordinate point of (1.8, 5.1), and the third coordinate point, (5.7, 2.6) A third line segment connecting the fourth coordinate point, a fourth line segment connecting the fourth coordinate point, and a fifth coordinate point equal to (7.0, 0.7), and a fifth line segment connecting the first coordinate point and the fifth coordinate point It has an iodine concentration and moisture content contained in the region surrounded by the line segment, and the polarizing film protective film is a light absorption layer having light absorption ability, and transmittance of light at a wavelength of 380 nm is 5% or less.

Description

A polarizing film laminate, an optical display panel in which the polarizing film laminate is used, a polarizing film laminate with a transparent adhesive layer, and a polarizing film assembly

The present invention relates to a polarizing film laminate, an optical display panel in which the polarizing film laminate is used, a polarizing film laminate with a transparent adhesive layer, and a polarizing film assembly.

In recent years, optical display panels such as liquid crystal panels and organic EL panels have been used in electronic devices such as smartphones and personal computers, and in telephone products such as IoT home appliances, as well as in motorized vehicles such as automobiles, trains, and airplanes. Various possibilities have also been found for its use. For example, it is conceivable to mount an optical display panel on a windshield, dashboard, exterior, and other various body parts of a vehicle to provide various information to the driver and also to transmit various information to the outside.

In accordance with such a situation, a further improvement in durability under harsh environments, such as in a motorized driving vehicle, is demanded. For example, a polarizing film laminate (polarizing plate) used in an optical display panel, particularly, an optical display panel, or a polarizing film used in a polarizing film laminate by the use environment such as high temperature or high humidity, or by irradiation of sunlight The performance of (polarizer) deteriorates, and in the worst case, it may become unusable.

An example of the polarizer which improved durability in high temperature thru|or high-humidity environment in patent document 1, the polarizing plate using this polarizer, and the liquid crystal display device using the polarizing plate is disclosed. As durability, red color loss in orthogonal nicols (polarization loss of long-wavelength light) that occurs when left under high-temperature conditions is a problem, and in order to solve this problem, zinc is contained, It is proposed to adjust the relationship to a predetermined range.

Similarly, Patent Document 2 relates to a polarizing plate used for an on-vehicle image display device having improved durability in a high-temperature or high-humidity environment, and pays attention to the moisture content of the polarizing plate and the saturated absorption amount of the protective film. High-temperature durability is required for vehicle-mounted polarizing plates. In high-temperature environments, the transmittance of the polarizing plate may be remarkably reduced due to polyenization. In order to solve this problem, in Patent Document 2, saturated absorption amount is It is proposed to use the thing of this predetermined range and to make small the moisture content of a polarizing plate.

Patent document 3 also relates to the polarizing plate which improved durability under high temperature thru|or high humidity, Here, attention is paid to the moisture content of a polarizing plate, and the moisture permeability of a protective film. In a high-temperature environment, etc., the inside of the polarizing plate is in a high-temperature and high-humidity state, and as a result, the amount of change in light transmittance, polarization degree, color of the image, etc. increases, and the reliability as a polarizing plate becomes low, so the moisture content of the polarizer is reduced as much as possible. In this, bonding of a protective film with low moisture permeability is proposed.

Similarly, Patent Document 4 relates to a polarizing plate with increased durability under high temperature to high humidity or low temperature, which may deteriorate the polarizer by ultraviolet or infrared rays, and liquid crystal display device ( It is described that the visibility of LCD) may deteriorate, and in order to solve these problems, it has been proposed to contain an ultraviolet absorber or an infrared absorber in the protective film of the polarizing film to prevent fluctuations in transmittance.

Japanese Patent Laid-Open No. 2003-29042 Japanese Patent Laid-Open No. 2014-102353 Japanese Patent Laid-Open No. 2002-90546 Japanese Patent Laid-Open No. 2006-184883

Regarding the polarizing film laminate used for an optical display panel, in particular, an optical display panel, or a polarizing film used for a polarizing film laminate, as a problem that occurs under a high temperature or high humidity environment, "polyenization", "color loss", and "Heat redness" is known.

Generally, "polyenization" refers to a phenomenon in which the single transmittance of a polarizing film layered product decreases by being placed in a high temperature or high humidity environment, and "color loss" and "heating redness" are similarly placed under a high temperature or high humidity environment. As a result, when the polarizing film laminate is cross-nicol-arranged and the orthogonal transmittance of wavelength 410 nm and wavelength 700 nm is measured, the orthogonal transmittance is a phenomenon in which the orthogonal transmittance rises, and "color loss" is particularly at the long wavelength side of about 700 nm and about 410 A phenomenon in which the transmittance on the short wavelength side of nm rises and color fading occurs in black display, on the other hand, "heating reddening" is known as a phenomenon in which the transmittance on the long wavelength side of about 700 nm increases and the polarizing film is discolored red in particular.

Patent Document 1 mainly focuses on the problem of “color loss”, Patent Document 2 mainly focuses on the problem of “polyenization”, and Patent Document 3 mainly focuses on the problem of “heating redness”. It is considered that the solution proposed in , at least, is effective for solving individual problems. However, the invention described in each patent document was not sufficiently sufficient to comprehensively solve these problems. Based on the fact that "polyenization", "color loss", and "heating redness" are all related to each other through iodine and water, and also through temperature and humidity that affects water, intensive research has been conducted. As a result, the applicant of this application acquired the knowledge that these problems can be solved comprehensively by adjusting the iodine concentration of a polarizing film, and the moisture content of a polarizing film laminated body.

As a result of further intensive research, the applicant of the present application found that sunlight, more precisely, ultraviolet rays, visible rays, and infrared rays contained in sunlight promote "polyenization", "color loss", and "heat redness", By suppressing the influence by sunlight in addition to discovering that especially "polyenization" is accelerated|stimulating, in addition to adjusting the iodine concentration of a polarizing film, and the moisture content of a polarizing film laminated body, "polyenization", "color loss" more effectively ', and the knowledge that the problem of "heating redness" can be comprehensively solved.

In addition to trying to adjust the iodine concentration of a polarizing film, and the moisture content of a polarizing film laminated body, this invention suppresses the influence by sunlight irradiation, "polyenization", "color loss", and these 3 of "heat redness" It aims to comprehensively solve dog problems.

In order to solve the above problems, a polarizing film laminate according to an aspect of the present invention includes a polarizing film made of a polyvinyl alcohol-based resin, and at least the surface of the polarizing film on the viewer side, either directly or through another optical film. As a polarizing film laminate with a transparent polarizing film protective film, the x-axis is the iodine concentration (wt.%) of the polarizing film, and the y-axis is the moisture content (g/m2) of the polarizing film laminate. In the x-y Cartesian coordinate system, a first line segment connecting a first coordinate point having an iodine concentration of 6.0 wt.% and a moisture content of 0.7 g/m2 and a second coordinate point having an iodine concentration of 1.8 wt.% and a moisture content of 4.2 g/m2; A second line segment connecting the second coordinate point and the third coordinate point having an iodine concentration of 1.8 wt.% and a water content of 5.1 g/m2, the third coordinate point, an iodine concentration of 5.7 wt.% and a water content of 2.6 g/m2 A third line segment connecting the fourth coordinate points, a fourth line segment connecting the fourth coordinate point and a fifth coordinate point having an iodine concentration of 7.0 wt.% and a moisture content of 0.7 g/m2, and the first coordinate point and the It has an iodine concentration and moisture content contained in the region surrounded by the fifth line segment connecting the fifth coordinate points, the polarizing film protective film is a light absorption layer having light absorption ability, and the transmittance of light at a wavelength of 380 nm is 5% or less have as a feature.

According to the polarizing film film laminate of this aspect, the problems of "polyenization", "color loss", and "heating redness" can be solved comprehensively.

The polarizing film film laminate of the said aspect WHEREIN: 4-30 micrometers may be sufficient as the film thickness of the said polarizing film.

In addition, in the polarizing film laminate according to another aspect of the present invention, a polarizing film made of a polyvinyl alcohol-based resin, and optically transparent polarized light bonded to at least the viewer-side surface of the polarizing film directly or through another optical film A polarizing film laminate having a film protective film, an x-y rectangular coordinate system in which the iodine concentration (wt.%) of the polarizing film is taken on the x-axis and the moisture content (g/m 2 ) of the polarizing film laminate is taken on the y-axis, respectively In the, a sixth line segment connecting the sixth coordinate point with an iodine concentration of 4.5 wt.% and a water content of 1.9 g/m2 and a second coordinate point with an iodine concentration of 1.8 wt.% and a water content of 4.2 g/m2, the second coordinate The second line segment connecting the point and the third coordinate point having an iodine concentration of 1.8 wt.% and a water content of 5.1 g/m2, the third coordinate point, and the seventh coordinate of an iodine concentration of 4.5 wt.% and a water content of 3.4 g/m2 It has an iodine concentration and moisture content contained in a region surrounded by a seventh line segment connecting the points and an eighth line segment connecting the sixth coordinate point and the seventh coordinate point, and the polarizing film protective film has light absorption capacity. It is a light absorbing layer having a light absorbing layer having a light transmittance of 5% or less at a wavelength of 380 nm.

In the polarizing film laminate of the above aspect, the sixth coordinate point is an eighth coordinate point having an iodine concentration of 4.0 wt.% and a water content of 2.4 g/m2, and the seventh coordinate point is an iodine concentration of 4.0 wt.% and a water content of 3.7 g The ninth coordinate point of /m 2 may be sufficient.

Further, the sixth coordinate point may be a tenth coordinate point having an iodine concentration of 3.7 wt.% and a water content of 2.6 g/m 2 , and the seventh coordinate point may be the fourth coordinate point.

The polarizing film film laminate of the said aspect WHEREIN: 11-30 micrometers may be sufficient as the film thickness of a polarizing film.

In addition, in the polarizing film laminate according to another aspect of the present invention, a polarizing film made of a polyvinyl alcohol-based resin, and optically transparent polarized light bonded to at least the viewer-side surface of the polarizing film directly or through another optical film A polarizing film laminate having a film protective film, an x-y rectangular coordinate system in which the iodine concentration (wt.%) of the polarizing film is taken on the x-axis and the moisture content (g/m 2 ) of the polarizing film laminate is taken on the y-axis, respectively In the ninth line segment connecting the first coordinate point of iodine concentration 6.0wt.% and water content 0.7g/m2, and the tenth coordinate point of iodine concentration 3.7wt.% and water content 2.6g/m2, the tenth coordinate A tenth line segment connecting the point and the fourth coordinate point with an iodine concentration of 5.7 wt.% and a water content of 2.6 g/m2, the fourth coordinate point, and the fifth coordinate with an iodine concentration of 7.0 wt.% and water content of 0.7 g/m2 It has an iodine concentration and moisture content contained in an area surrounded by an 11th line segment connecting the points, and a fifth line segment connecting the first coordinate point and the fifth coordinate point, wherein the polarizing film protective film has light absorption capacity. It is a light absorbing layer having a light absorbing layer having a light transmittance of 5% or less at a wavelength of 380 nm.

The polarizing film film laminate of the said aspect WHEREIN: 4-11 micrometers may be sufficient as the film thickness of a polarizing film.

Further, in the polarizing film laminate of the above aspect, the polarizing film protective film preferably has a light transmittance of 35% or less at a wavelength of 390 nm, and the polarizing film protective film has a light transmittance of 70% or less at a wavelength of 400 nm desirable.

Moreover, in the polarizing film film laminate of the said aspect, it is preferable that the said polarizing film contains zinc.

In addition, in the polarizing film laminate of the above aspect, a sample consisting of a polarizing film laminate and a glass plate laminated on both surfaces of the polarizing film laminate through an adhesive is subjected to xenon at a black panel temperature of 89° C. and 30% R.H. It is preferable that the single transmittance after 200 hours of irradiating light at an irradiance of 100 W/m 2 integrated in a wavelength range of 300 to 400 nm is -0.5 or more compared to the single transmittance before irradiation.

Thereby, the problem of polyenization can be effectively solved.

In the polarizing film laminate of the above aspect, the black panel temperature in the sample consisting of a polarizing film laminate and a glass plate laminated on both surfaces of the polarizing film laminate through an adhesive through an atmosphere of 89°C and 30% R.H. After irradiating xenon light with an irradiance of 100 W/m2 integrated in a wavelength range of 300 to 400 nm for 200 hours, the amount of change in the orthogonal transmittance at a wavelength of 410 nm is less than 1%, and the amount of change in the orthogonal transmittance at a wavelength of 700 nm is less than 5% it is preferable

Thereby, the problem of color fading can be solved effectively.

In the polarizing film laminate of the above aspect, the black panel temperature in the sample consisting of a polarizing film laminate and a glass plate laminated on both surfaces of the polarizing film laminate through an adhesive through an atmosphere of 89°C and 30% R.H. After irradiating xenon light with an irradiance of 100 W/m2 integrated in a wavelength range of 300 to 400 nm for 200 hours, the amount of change in the orthogonal transmittance at a wavelength of 410 nm is 1% or more, and the amount of change in the orthogonal transmittance at a wavelength of 700 nm is less than 5% it is preferable

Thereby, the problem of heating redness can be solved effectively.

In addition, in order to solve the above problem, the optical display panel according to one aspect of the present invention is an optical display cell, and the polarizing film according to any one of the above, which is bonded to one side of the optical display cell directly or through another optical film. a laminate and an optically transparent cover plate disposed along the polarizing film laminate on the opposite side to the optical display cell, wherein the optical display cell, the polarizing film laminate, and the transparent cover plate are An optical display panel attached to a vehicle body of a power-driven vehicle is characterized by being adhered by a transparent adhesive layer that fills the gap free of gaps therebetween.

The optical display panel of the said aspect WHEREIN: The said transparent cover plate may have a function of a capacitive touch sensor.

Moreover, the optical display panel of the said aspect WHEREIN: The ITO layer used as a component of a capacitive touch sensor may be formed between the said transparent cover plate and the said polarizing film laminated body.

A polarizing film laminate with a transparent adhesive layer according to an aspect of the present invention includes a polarizing film made of a polyvinyl alcohol-based resin, and an optically transparent polarizing film bonded to at least the viewer-side surface of the polarizing film directly or through another optical film. A polarizing film laminate having a protective film, and a transparent adhesive layer laminated on the viewing side rather than the polarizing film laminate, wherein the iodine concentration (wt.%) of the polarizing film is on the x-axis and the polarized light is on the y-axis In the x-y rectangular coordinate system in which the moisture content (g/m2) of the film laminate is taken, respectively, the first coordinate point having an iodine concentration of 6.0 wt.% and a moisture content of 0.7 g/m2, an iodine concentration of 1.8 wt.% and a moisture content of 4.2 g/m2 a first line segment connecting the second coordinate point of A third line segment connecting the fourth coordinate point with an iodine concentration of 5.7 wt.% and a moisture content of 2.6 g/m2, the fourth coordinate point and the fifth coordinate point with an iodine concentration of 7.0 wt.% and water content of 0.7 g/m2 has an iodine concentration and moisture content contained in a region surrounded by a fourth line segment and a fifth line segment connecting the first coordinate point and the fifth coordinate point, at least among the transparent adhesive layer and the polarizing film protective film The transparent adhesive layer is a light absorption layer having a light absorption ability, and has a light transmittance of 5% or less at a wavelength of 380 nm of the laminate of the transparent adhesive layer and the polarizing film protective film.

A polarizing film laminate with a transparent adhesive layer according to another aspect of the present invention is an optically transparent polarizing film made of a polyvinyl alcohol-based resin and bonded directly or through another optical film to a surface opposite to the viewing side of the polarizing film. A polarizing film laminate having a polarizing film protective film, and a transparent adhesive layer laminated on a viewing side rather than the polarizing film laminate, wherein the iodine concentration (wt.%) of the polarizing film is on the x-axis and the y-axis is In the x-y rectangular coordinate system in which the moisture content (g/m2) of the polarizing film laminate is respectively taken, the first coordinate point having an iodine concentration of 6.0 wt.% and a moisture content of 0.7 g/m2, an iodine concentration of 1.8 wt.% and a moisture content of 4.2 g A first line segment connecting the second coordinate point of /m2, a second line segment connecting the second coordinate point, and a third coordinate point having an iodine concentration of 1.8wt.% and a moisture content of 5.1g/m2, the third coordinate point and a third line segment connecting the fourth coordinate point with an iodine concentration of 5.7 wt.% and a moisture content of 2.6 g/m2, the fourth coordinate point, and a fifth coordinate point with an iodine concentration of 7.0 wt.% and water content of 0.7 g/m2 has an iodine concentration and moisture content contained in a region surrounded by a fourth line segment connecting the first coordinate point and a fifth line segment connecting the fifth coordinate point; and the light transmittance at a wavelength of 380 nm of the transparent adhesive layer is 5% or less.

A polarizing film assembly according to an aspect of the present invention includes a polarizing film made of a polyvinyl alcohol-based resin, and an optically transparent polarizing film protective film bonded to at least the viewer-side surface of the polarizing film directly or through another optical film. A polarizing film laminate, a transparent adhesive layer laminated on the viewing side than the polarizing film laminate, and an optically transparent cover plate laminated on the viewing side than the transparent adhesive layer, wherein the iodine concentration of the polarizing film (wt) on the x-axis %) in the x-y rectangular coordinate system in which the moisture content (g/m2) of the polarizing film laminate is respectively taken on the y-axis, the first coordinate point having an iodine concentration of 6.0 wt.% and a moisture content of 0.7 g/m2, and iodine A first line segment connecting the second coordinate points with a concentration of 1.8wt.% and a moisture content of 4.2g/m2, the second coordinate point, and a third coordinate point with an iodine concentration of 1.8wt.% and a water content of 5.1g/m2 A third line segment connecting the second line segment, the third coordinate point, and the fourth coordinate point having an iodine concentration of 5.7 wt.% and a water content of 2.6 g/m2, the fourth coordinate point, and an iodine concentration of 7.0 wt.% and water content It has an iodine concentration and moisture content contained in a region surrounded by a fourth line segment connecting the fifth coordinate point of 0.7 g/m2, and a fifth line segment connecting the first coordinate point and the fifth coordinate point, wherein Among the polarizing film protective film, the transparent adhesive layer and the transparent cover plate, at least the transparent cover plate is a light absorbing layer having a light absorption ability, and the wavelength of the laminate of the polarizing film protective film, the transparent adhesive layer and the transparent cover plate is 380 nm. has a light transmittance of 5% or less.

A polarizing film assembly according to a separate aspect of the present invention comprises a polarizing film made of a polyvinyl alcohol-based resin, and an optically transparent polarizing film protective film bonded directly or through another optical film to a surface opposite to the viewing side of the polarizing film. A polarizing film laminate having a polarizing film laminate, a transparent adhesive layer laminated on the viewing side than the polarizing film laminate, and an optically transparent cover plate laminated on the viewing side rather than the transparent adhesive layer, the iodine concentration of the polarizing film on the x-axis (wt.%), in the x-y rectangular coordinate system in which the moisture content (g/m2) of the polarizing film laminate is respectively taken on the y-axis, the first coordinate point of the iodine concentration 6.0wt.% and the moisture content 0.7g/m2 , a first line segment connecting the second coordinate points with an iodine concentration of 1.8 wt.% and a water content of 4.2 g/m2, the second coordinate point, and a third coordinate point with an iodine concentration of 1.8 wt.% and a water content of 5.1 g/m2 The second line segment connecting the second line segment, the third coordinate point, and the third line segment connecting the fourth coordinate point having an iodine concentration of 5.7 wt.% and a water content of 2.6 g/m2, the fourth coordinate point, and an iodine concentration of 7.0 wt.% and an iodine concentration and moisture content contained in a region surrounded by a fourth line segment connecting the fifth coordinate point of 0.7 g/m2 of moisture content, and a fifth line segment connecting the first coordinate point and the fifth coordinate point, , Among the transparent adhesive layer and the transparent cover plate, at least the transparent cover plate is a light absorbing layer having light absorption ability, and the light transmittance of the laminate of the transparent adhesive layer and the transparent cover plate at a wavelength of 380 nm is 5% or less, characterized in that have

According to the present invention, in addition to trying to adjust the iodine concentration of the polarizing film and the moisture content of the polarizing film layered product, by suppressing the influence by sunlight irradiation, "polyenization", "color loss", and "heat redness" The problem can be solved comprehensively.

1 is a schematic diagram showing a layer configuration of an optical display panel.
It is a figure explaining an example of the manufacturing method of a polarizing film.
Fig. 3 is a view showing an example of a layer configuration of a polarizing film protective film positioned on the viewer side.
4 is a diagram showing a calibration curve for obtaining the iodine concentration of the polarizing film.
5 is a diagram illustrating a structure for a reliability test.
6 is a diagram in which the results of Examples and Comparative Examples are plotted around Examples.
7 is a diagram in which the results of Examples and Comparative Examples are plotted based on Comparative Examples.

EMBODIMENT OF THE INVENTION Hereinafter, one preferred embodiment of this invention is described, referring an accompanying drawing. Although only suitable embodiments are shown for convenience of description, of course, it is not intended to limit this invention by this.

The present invention relates to an optical display panel, for example, an optical display panel attached to a vehicle body of a motor vehicle, an electric vehicle, an airplane, or a vehicle driven by power, and a polarizing film laminate used for the optical display panel is aimed at Here, "attached to a vehicle body" means not only when an optical display panel or a polarizing film laminate is fixed to a vehicle body, but also, for example, like an optical display panel or a polarizing film laminate used in a smartphone, etc. The case where they are freely mounted on or carried in a motorized vehicle is also included. In other words, "attached to a vehicle body" includes all situations in which an optical display panel or a polarizing film laminate is used together with a motor vehicle and may be exposed to a high temperature or high humidity environment.

1. Optical display panel

1 is a schematic diagram showing an example of the layer configuration of the optical display panel 1 . The optical display panel 1 includes at least an optical display cell 10 , a polarizing film laminate 12 laminated on one surface 10a side (viewing side) of the optical display cell 10 , and optical display and an optically transparent cover plate 14 disposed along the polarizing film laminate 12 on the opposite side to the cell 10, ie, on the viewing side. Between the optical display cell 10 and the polarizing film laminate 12, using a transparent adhesive layer made of a transparent adhesive (PSA) 11, it is adhered in a state where there is no gap. Similarly, there is no gap between the cover plate 14 and the polarizing film laminate 12 using a transparent adhesive layer made of a transparent adhesive (OCA) 13 laminated on the viewing side rather than the polarizing film laminate 12 . The polarizing film assembly 19 including the cover plate 14 , the transparent adhesive 13 , and the polarizing film laminate 12 is formed. Another polarizing film laminate 17 is disposed on the other side 10b side of the optical display cell 10 via a transparent adhesive (PSA) 16 . In addition, in this specification, unless otherwise indicated, the word "adhesion" includes adhesion (pressure-sensitive adhesion). The optical display cell 10 and the polarizing film laminate 12 may be directly bonded by the transparent adhesive 11, but if necessary, a retardation film, a viewing angle compensation film, or other optical film (not shown) through It may be adhered.

1-1. Optical display cell

As an example of the optical display cell 10, a liquid crystal cell and an organic electroluminescent cell are mentioned.

As an organic electroluminescent cell, what laminated|stacked in order a transparent electrode, an organic light emitting layer, and a metal electrode on a transparent substrate, and formed the light emitting body (organic electroluminescent light emitting body), etc. are used suitably. The organic light emitting layer is a laminate of various organic thin films, for example, a laminate of a hole injection layer made of a triphenylamine derivative and a light emitting layer made of a fluorescent organic solid such as anthracene, or a laminate of these light emitting layers and a perylene derivative. Various layer configurations, such as a laminate of electron injection layers, or a laminate of a hole injection layer, a light emitting layer, and an electron injection layer, can be employed.

As the liquid crystal cell, either a reflective liquid crystal cell using external light, a transmissive liquid crystal cell using light from a light source such as the backlight 18, or a transflective semi-reflective liquid crystal cell using both light from the outside and light from the light source is used. also good When the liquid crystal cell uses light from a light source, as shown in FIG. 1 , the polarizing film laminate 17 is also disposed on the side opposite to the viewing side of the optical display cell (liquid crystal cell) 10, and further, for example, For example, a light source 18 such as a backlight is disposed. The polarizing film laminate 17 on the side of the light source and the liquid crystal cell 10 are adhered with a suitable transparent adhesive 16 layer. As a drive method of a liquid crystal cell, the thing of arbitrary types, such as a VA mode, an IPS mode, a TN mode, an STN mode, and a bend orientation ((pi) type|mold), can be used, for example.

1-2. cover plate

As an example of the cover plate 14, a transparent plate (window layer), a touch panel, etc. are mentioned. As the transparent plate, a transparent plate having an appropriate mechanical strength and thickness is used. As such a transparent plate, for example, a transparent resin plate such as an acrylic resin or polycarbonate resin, or a glass plate is used. The surface of the cover plate 14 may be subjected to a low reflection treatment with, for example, a low reflection film (not shown). As a touch panel, various touch panels, such as a resistive film method, a capacitive method, an optical method, and an ultrasonic method, a glass plate, a transparent resin board, etc. provided with a touch sensor function are used.

The cover plate 14 may contain an ultraviolet absorber to form a light absorbing layer having light absorption ability, or in other words, the transmittance of the cover plate 14 with respect to ultraviolet rays may be set to a desired value. For example, the cover plate 14 is formed of a transparent resin plate such as an acrylic resin or polycarbonate resin, or a glass plate, and at the time of its production, for example, benzotriazole-based, benzophenone-based, salicylic acid phenyl ester-based, tria Jin-based UV absorbers are mentioned. Examples of the benzotriazole-based UV absorber include 2-(5-methyl-2-hydroxyphenyl)benzotriazole, 2-(2H-benzotriazol-2-yl)-p-cresol, and 2-(2H-benzo triazol-2-yl)-4,6-di-tert-pentylphenol, 2-(2'-hydroxy-5'methacryloxyethylphenyl)-2H-benzotriazole, etc. are mentioned. Examples of the benzophenone-based UV absorber include 2-hydroxy-4-octoxybenzophenone, 2,4-dihydroxybenzophenone, 2-hydroxy-4-methoxy-4'-chlorbenzophenone, 2, 2-dihydroxy-4-methoxybenzophenone, 2,2-dihydroxy-4,4'-dimethoxybenzophenone, etc. are mentioned. As a salicylic acid phenyl ester type|system|group ultraviolet absorber, p-t- butylphenyl salicylic acid ester etc. are mentioned, for example. Examples of the triazine-based UV absorber include 2,4-diphenyl-6-(2-hydroxy-4-methoxyphenyl)-1,3,5-triazine, 2,4-diphenyl-6-(2). -Hydroxy-4-ethoxyphenyl)-1,3,5-triazine, 2,4-diphenyl-(2-hydroxy-4-propoxyphenyl)-1,3,5-triazine, 2 ,4-diphenyl-(2-hydroxy-4-butoxyphenyl)-1,3,5-triazine, 2,4-diphenyl-6-(2-hydroxy-4-butoxyphenyl)- 1,3,5-triazine, 2,4-diphenyl-6-(2-hydroxy-4-hexyloxyphenyl)-1,3,5-triazine, 2,4-diphenyl-6-( 2-hydroxy-4-octyloxyphenyl)-1,3,5-triazine, 2,4-diphenyl-6-(2-hydroxy-4-dodecyloxyphenyl)-1,3,5- Triazine, 2,4-diphenyl-6-(2-hydroxy-4-benzyloxyphenyl)-1,3,5-triazine, 2,4-diphenyl-6-(2-hydroxy-4 By mixing an ultraviolet absorber such as -butoxyethoxyphenyl)-1,3,5-triazine in the transparent resin, the cover plate 14 can be used as the light absorption layer. By forming the light absorption layer, the transmittance of ultraviolet rays in the polarizing film assembly 19 including the polarizing film laminate 12 is set to a desired value, and more effectively, "polyenization", "color loss", and " It is possible to comprehensively solve the problem of "heating redness". When only the cover plate 14 is used as the light absorption layer, for example, the transmittance at a wavelength of 380 nm is preferably 5% or less, more preferably 3% or less, and still more preferably 2% or less. The lower limit is, for example, 0.1% or more and 1% or more. 35 % or less is preferable, as for the transmittance|permeability in wavelength 390 nm, 30 % or less is more preferable, and its 28 % or less is still more preferable. The lower limit is, for example, 10% or more, 20% or more, or 25% or more. 70% or less is preferable and, as for the transmittance|permeability in wavelength 400nm, 68 % or less is more preferable. The lower limit is, for example, 50% or more, 60% or more, or 65% or more. The transmittance at a wavelength of 420 nm is preferably 90% or less. The lower limit is, for example, 80% or more and 85% or more. These transmittances represent the transmittances of the cover plate 14 in the initial state. In addition to the ultraviolet absorber, infrared rays such as phthalocyanine light absorber, naphthalocyanine light absorber, polymethine light absorber, diphenylmethane light absorber, triphenylmethane light absorber, quinone light absorber, azo light absorber, etc. An absorbent may be mixed.

When a capacitive touch panel is used as the cover plate 14 , it is preferable that a front transparent plate made of glass or a transparent resin plate is provided on a more visible side than the touch panel. In addition, in this case, an ITO layer (not shown) serving as a component of the capacitive touch sensor is formed on the transparent adhesive 13 for bonding between the cover plate 14 and the polarizing film laminate 12 . .

1-3. Transparent Adhesive

As the transparent adhesives 11, 13, and 16, for example, various adhesives disclosed in Japanese Patent No. 6071459 can be suitably used. For example, a (meth)acrylic adhesive may be used and the curable adhesive which does not contain (meth)acrylic acid may be used. As the latter example, for example, an isoprene-based UV curable adhesive is suitably used. The isoprene-based UV curable adhesive may contain an isoprene derivative in addition to isoprene as a monomer component. The adhesive may contain monomer components other than the isoprene-based monomer. As the monomer component, a (meth)acrylic acid derivative such as (meth)acrylic acid ester may be contained. Moreover, in order to suppress the fall of the transmittance|permeability by polyenization of polyvinyl alcohol, it is effective to reduce content of the acidic component in the transparent adhesive agents 11, 13, 16.

The transparent adhesive 11, 13, 16, for example, the transparent adhesive 13 (transparent adhesive layer) laminated on the viewing side rather than the polarizing film laminate 12 contains a UV absorber to form a light absorption layer having light absorption ability. In other words, you may set the transmittance|permeability with respect to the ultraviolet-ray of a transparent adhesive agent to a desired value. For example, a transparent adhesive is formed with a (meth)acrylic adhesive, and at the time of its production, for example, a benzotriazole-based, benzophenone-based, salicylic acid phenyl ester-based, and triazine-based ultraviolet absorber is exemplified. Examples of the benzotriazole-based UV absorber include 2-(5-methyl-2-hydroxyphenyl)benzotriazole, 2-(2H-benzotriazol-2-yl)-p-cresol, and 2-(2H-benzo triazol-2-yl)-4,6-di-tert-pentylphenol, 2-(2'-hydroxy-5'methacryloxyethylphenyl)-2H-benzotriazole, etc. are mentioned. Examples of the benzophenone-based UV absorber include 2-hydroxy-4-octoxybenzophenone, 2,4-dihydroxybenzophenone, 2-hydroxy-4-methoxy-4'-chlorbenzophenone, 2, 2-dihydroxy-4-methoxybenzophenone, 2,2-dihydroxy-4,4'-dimethoxybenzophenone, etc. are mentioned. As a salicylic acid phenyl ester type|system|group ultraviolet absorber, p-t- butylphenyl salicylic acid ester etc. are mentioned, for example. Examples of the triazine-based UV absorber include 2,4-diphenyl-6-(2-hydroxy-4-methoxyphenyl)-1,3,5-triazine, 2,4-diphenyl-6-(2). -Hydroxy-4-ethoxyphenyl)-1,3,5-triazine, 2,4-diphenyl-(2-hydroxy-4-propoxyphenyl)-1,3,5-triazine, 2 ,4-diphenyl-(2-hydroxy-4-butoxyphenyl)-1,3,5-triazine, 2,4-diphenyl-6-(2-hydroxy-4-butoxyphenyl)- 1,3,5-triazine, 2,4-diphenyl-6-(2-hydroxy-4-hexyloxyphenyl)-1,3,5-triazine, 2,4-diphenyl-6-( 2-hydroxy-4-octyloxyphenyl)-1,3,5-triazine, 2,4-diphenyl-6-(2-hydroxy-4-dodecyloxyphenyl)-1,3,5- Triazine, 2,4-diphenyl-6-(2-hydroxy-4-benzyloxyphenyl)-1,3,5-triazine, 2,4-diphenyl-6-(2-hydroxy-4 A transparent adhesive can be used as the light absorption layer by mixing an ultraviolet absorber such as -butoxyethoxyphenyl)-1,3,5-triazine in the transparent resin. By forming such a light absorption layer, the transmittance of ultraviolet rays in the polarizing film laminate 12 with a transparent adhesive layer or in the polarizing film assembly 19 including the polarizing film laminate 12 is set to a desired value, and more Effectively, the problems of "polyenization", "color loss", and "heating redness" can be comprehensively solved. When only the transparent adhesive 13 is used as the light absorption layer, for example, the transmittance at a wavelength of 380 nm is preferably 5% or less, more preferably 3% or less, and still more preferably 2% or less. The lower limit is, for example, 0.1% or more and 1% or more. 35 % or less is preferable, as for the transmittance|permeability in wavelength 390 nm, 30 % or less is more preferable, and its 28 % or less is still more preferable. The lower limit is, for example, 10% or more, 20% or more, or 25% or more. 70% or less is preferable and, as for the transmittance|permeability in wavelength 400nm, 68 % or less is more preferable. The lower limit is, for example, 50% or more, 60% or more, or 65% or more. The transmittance at a wavelength of 420 nm is preferably 90% or less. The lower limit is, for example, 80% or more and 85% or more. These transmittances represent the transmittances of the transparent adhesive in the initial state. In addition to the ultraviolet absorber, infrared rays such as phthalocyanine light absorber, naphthalocyanine light absorber, polymethine light absorber, diphenylmethane light absorber, triphenylmethane light absorber, quinone light absorber, azo light absorber, etc. An absorbent may be mixed.

2. Polarizing film laminate

The polarizing film laminate 12 includes at least a polarizing film 120 and a polarizing film protective film 121 bonded to at least a viewing side of the polarizing film 120 . The polarizing film laminate 12 may further include a polarizing film protective film 122 on the side opposite to the viewing side of the polarizing film 120 . In addition to or instead of using the cover plate 14 and/or the transparent adhesive 13 etc. as a light absorption layer, you may make the polarizing film protective film 121 function as a light absorption layer. By forming the light absorption layer, the transmittance of ultraviolet rays of the polarizing film laminate 12 itself is set to a desired value, and the problems of "polyenization", "color loss", and "heating redness" are comprehensively solved more effectively. can Although not specifically illustrated, another optical film may be formed between the polarizing film 120 and the polarizing film protective films 121 and 122 .

The present invention is to comprehensively solve the problems caused by the use environment of high temperature to high humidity, and the irradiation of sunlight, in particular, the problems of "polyenization", "color loss", and "heating redness", in particular, Attention is paid to the iodine concentration (wt.%) of the polarizing film 120 and the moisture content (g/m 2 ) of the polarizing film laminate 12 . These values can be adjusted at the time of manufacture of a polarizing film, or manufacture of a polarizing film laminated body, for example.

2-1. polarizing film

The polarizing film 120 is made of a polyvinyl alcohol (PVA)-based resin film containing iodine. As the material of the PVA-based film applied to the polarizing film, PVA or a derivative thereof is used. Examples of derivatives of PVA include polyvinyl formal and polyvinyl acetal, olefins such as ethylene and propylene, unsaturated carboxylic acids such as acrylic acid, methacrylic acid, and crotonic acid, alkyl esters thereof, acrylamide, etc. thing can be heard As for PVA, the thing of about 1000-10000 degree of polymerization and about 80-100 mol% of saponification degrees is generally used. A PVA-based film made of these materials tends to contain moisture.

The PVA-based film may contain additives such as a plasticizer. As a plasticizer, a polyol, its condensate, etc. are mentioned, For example, glycerol, diglycerol, triglycerol, ethylene glycol, propylene glycol, polyethyleneglycol etc. are mentioned. Although the amount in particular of a plasticizer is not restrict|limited, 20 weight% or less of PVA type film is suitable.

2-1-1. Preparation of polarizing film

In the production of a polarizing film having a film thickness of 6 µm or more, for example, a dyeing treatment in which the PVA-based film is dyed with iodine and a stretching treatment in which the PVA-based film is stretched in at least one direction are performed. In general, a method in which the PVA-based film is subjected to a series of treatments including swelling, dyeing, crosslinking, stretching, water washing and drying treatment is adopted.

The swelling treatment is performed, for example, by immersing the PVA-based film in a swelling bath (water bath). By this process, while washing|cleaning the stain|pollution|contamination and antiblocking agent on the surface of a PVA-type film, by swelling a PVA-type film, nonuniformity, such as a dyeing|staining dispersion|variation, can be prevented. Glycerin, potassium iodide, etc. may be suitably added to a swelling bath. The temperature of the swelling bath is, for example, about 20 to 60°C, and the immersion time to the swelling bath is, for example, about 0.1 to 10 minutes.

The dyeing treatment is performed, for example, by immersing the PVA-based film in an iodine solution. The iodine solution is usually an iodine aqueous solution, and contains iodine and potassium iodide as a dissolution aid. Iodine concentration is, for example, about 0.01 to 1 weight%, and it is preferable that it is 0.02 to 0.5 weight%. The concentration of potassium iodide is, for example, about 0.01 to 10% by weight, preferably 0.02 to 8% by weight.

The dyeing process WHEREIN: The temperature of an iodine solution is about 20-50 degreeC, for example, Preferably it is 25-40 degreeC. Immersion time is, for example, about 10 to 300 second, Preferably it is the range for 20 to 240 second. In iodine dyeing process, conditions, such as the density|concentration of an iodine solution, the immersion temperature to the iodine solution of a PVA-type film, and immersion time, are adjusted so that the iodine content and potassium content in a PVA-type film may become the said range.

The crosslinking treatment is performed, for example, by immersing the PVA-based film dyed with iodine in a treatment bath containing a crosslinking agent. Any suitable crosslinking agent is employed as the crosslinking agent. Specific examples of the crosslinking agent include boron compounds such as boric acid and borax, glyoxal, and glutaraldehyde. These are used individually or in combination. Although water is common as a solvent used for the solution of a crosslinking bath, an organic solvent which has compatibility with water may be added in an appropriate amount. A crosslinking agent is used in the ratio of 1-10 weight part with respect to 100 weight part of solvents. It is preferable that the solution of a crosslinking bath further contains adjuvants, such as iodide. The concentration of the auxiliary is preferably 0.05 to 15% by weight, more preferably 0.5 to 8% by weight. The temperature of the crosslinking bath is, for example, about 20 to 70°C, preferably 40 to 60°C. The immersion time to the crosslinking bath is, for example, about 1 second to 15 minutes, and preferably 5 seconds to 10 minutes.

The stretching treatment is a treatment in which the PVA-based film is stretched in at least one direction. Generally, a PVA-type film is uniaxially stretched in a conveyance direction (longitudinal direction). The stretching method is not particularly limited, and both the wet stretching method and the dry stretching method may be employed. When the wet stretching method is employed, the PVA-based film is stretched in a treatment bath at a predetermined magnification. As the solution of the stretching bath, a solution to which a compound necessary for various treatments is added in a solvent such as water or an organic solvent (eg ethanol) is preferably used. Examples of the dry stretching method include an inter-roll stretching method, a heated roll stretching method, and a compression stretching method. Manufacture of a polarizing film WHEREIN: The extending|stretching process may be performed at any stage. Specifically, it may be performed simultaneously with swelling, dyeing|staining and bridge|crosslinking, and may be performed anytime before and after these each process. In addition, extending|stretching may be performed in multiple steps. The cumulative draw ratio of a PVA-type film is 5 times or more, for example, Preferably it is about 5-7 times.

The PVA-based film (stretched film) subjected to each of the above treatments is subjected to water washing treatment and drying treatment according to a conventional method.

The water washing process is performed by immersing a PVA-type film in a water washing bath, for example. The water washing bath may be pure water or an aqueous solution of iodide (eg, potassium iodide, sodium iodide, etc.). The concentration of the aqueous iodide solution is preferably 0.1 to 10% by weight. Auxiliaries, such as zinc sulfate and zinc chloride, may be added to the aqueous solution of iodide.

Water washing temperature is 5-50 degreeC, for example, Preferably it is 10-45 degreeC, More preferably, it is the range of 15-40 degreeC. Immersion time is, for example, about 10-300 second, Preferably it is 20-240 second. The water washing process may be performed only once, and may be performed multiple times as needed. When the water washing treatment is performed a plurality of times, the type and concentration of the additive contained in the water washing bath used for each treatment is appropriately adjusted.

The drying treatment of the PVA-based film is performed by any suitable method (for example, natural drying, air drying, heat drying).

2-1-2. Preparation of polarizing film

A polarizing film having a film thickness of less than 6 µm can be produced, for example, by the manufacturing method disclosed in Japanese Patent No. 4751481. This manufacturing method includes a laminate production process for forming a PVA-based resin layer on a thermoplastic substrate, a stretching process for extending the PVA-based resin layer integrally with the thermoplastic resin substrate, a dyeing process for adsorbing a dichroic substance to the PVA resin layer, etc. includes If necessary, insolubilization treatment, crosslinking treatment, drying treatment, washing treatment, and the like of the PVA-based resin layer may be applied. The stretching treatment may be performed before or after the dyeing treatment, and any stretching method of aerial stretching and stretching in water such as aqueous boric acid solution may be employed. In addition, even if extending|stretching may be extending|stretching in one stage, the extending|stretching of two or more stages may be sufficient as it.

An example of the manufacturing method of a polarizing film is demonstrated with reference to FIG. Here, the polarizing film is produced by extending|stretching the PVA-type resin layer formed into a film on the resin base material integrally with the said resin base material.

[Laminate production process (A)]

First, an amorphous ester-based thermoplastic resin substrate having a glass transition temperature of 75 ° C. and having a thickness of 200 μm, for example, isophthalic acid copolymerized polyethylene terephthalate obtained by copolymerizing 6 mol% of isophthalic acid (hereinafter referred to as “amorphous PET”) ) (6) and PVA powder having a polymerization degree of 1000 or more and a saponification degree of 99% or more dissolved in water to prepare an aqueous PVA solution having a concentration of 4 to 5% by weight. Next, in the laminate manufacturing apparatus 20 provided with the application means 21, the drying means 22, and the surface modification processing apparatus 23, the PVA aqueous solution is apply|coated to this amorphous PET base material 6, 50 It is dried at a temperature of -60°C to form a PVA layer 2 having a thickness of 7 µm with a glass transition temperature of 80°C on the PET substrate 6 . Thereby, the laminated body 7 containing the PVA layer of 7 micrometers thickness is produced. At this time, by corona-treating the surface of the amorphous PET base material 6 with the surface modification processing apparatus 23, the adhesiveness of the amorphous PET base material 6 and the PVA layer 2 formed into a film can be improved.

Next, the laminated body 7 containing a PVA layer is finally produced as a 3-micrometer-thick polarizing film through the following processes including the two-stage extending|stretching process of aerial auxiliary stretching and boric acid underwater stretching.

[Air-assisted stretching treatment (B)]

In the air-assisted stretching treatment (B) of the first stage, the laminate 7 including the PVA layer 2 with a thickness of 7 μm is stretched integrally with the PET substrate 6, and the PVA layer 2 with a thickness of 5 μm is drawn integrally. ), a "stretched laminate 8" containing Specifically, in the aerial auxiliary stretching processing apparatus 30 in which the stretching means 31 is disposed in the oven 33, the laminate 7 including the PVA layer 2 having a thickness of 7 μm is stretched at 130°C. It hangs on the extending means 31 of the oven 33 set to the temperature environment, and it stretches uniaxially at the free end so that a draw ratio may become 1.8 times, and the extending|stretching laminated body 8 is produced|generated. At this stage, the roll 8' of the stretched laminate 8 can be manufactured by the winding device 32 installed in parallel with the oven 30.

[Dyeing treatment (C)]

Next, by the dyeing process (C), the colored laminate 9 in which the iodine of the dichroic substance was adsorbed to the 5 micrometers-thick PVA layer 2 in which PVA molecules were oriented is produced|generated. Specifically, in the dyeing apparatus 40 provided with the dyeing bath 42 of the dyeing liquid 41, it is unwound from the feeding apparatus 43 equipped with the roll 8' attached to the dyeing apparatus 40. The stretched laminate 8 is immersed in a dyeing solution 41 containing iodine and potassium iodide at a liquid temperature of 30° C. for an arbitrary time so that the single transmittance of the PVA layer constituting the finally formed polarizing film becomes 40 to 44%. Thereby, the colored laminated body 9 which made iodine adsorb|suck to the aligned PVA layer 2 of the stretched laminated body 8 is produced|generated.

In this process, in order to prevent the dyeing liquid 41 from dissolving the PVA layer 2 contained in the stretched laminated body 8, water is used as a solvent and the iodine concentration is 0.30 weight%. In addition, in the dyeing solution 41, the concentration of potassium iodide for dissolving iodine in water is 2.1% by weight. The ratio of the concentration of iodine to potassium iodide is 1 to 7. More specifically, by immersing the stretched laminate 8 in a dyeing solution 41 having an iodine concentration of 0.30% by weight and a potassium iodide concentration of 2.1% by weight for 60 seconds, a PVA layer 2 having a thickness of 5 μm in which PVA molecules are oriented A colored laminate 9 to which iodine is adsorbed is produced.

[Boric acid underwater stretching treatment (D)]

By the second stage stretching treatment in boric acid water, the colored laminate 9 including the PVA layer 2 in which iodine is oriented is further stretched, and a PVA layer in which iodine is oriented constituting a 3 μm-thick polarizing film is included. to produce an optical film laminate 60 . Specifically, the colored laminate ( 9) is immersed in an aqueous boric acid solution 51 set to a stretching temperature environment of 65 ° C. containing boric acid and potassium iodide, and then hung on the stretching means 53 disposed in the boric acid submerged treatment apparatus 50, so that the stretching ratio is The optical film laminated body 60 containing the PVA layer of 3 micrometers thickness is produced|generated by extending|stretching in the free end uniaxial so that it may become 3.3 times.

[Washing Treatment (G)]

Next, the optical film laminated body 60 containing a polarizing film, Preferably, it is sent to a washing process (G) as it is. The purpose of the washing process (G) is to wash away unnecessary residues adhering to the surface of the polarizing film with the washing liquid 81 of the washing device 80 . However, the washing process (G) is abbreviate|omitted and the optical film laminated body 60 containing the polarizing film taken out can also be sent directly to the drying process (H).

[Dry treatment (H)]

The washed optical film laminate 60 is sent to a drying process H, where it is dried. Next, the dried optical film laminate 60 is wound up as the optical film laminate 60 of a continuous web by the winding device 91 attached to the drying apparatus 90, The optical film laminated body containing a polarizing film A roll of (60) is created. Any suitable method, for example, natural drying, air drying, and heat drying, can be employ|adopted as drying process (H). For example, in the drying apparatus 90 of oven, it can dry for 240 second by 60 degreeC warm air.

2-1-3. etc

The polarizing film preferably contains zinc. When a polarizing film contains zinc, there exists a tendency for the fall and color deterioration of the transmittance|permeability of the polarizing film laminated body after a heat test to be suppressed. When a polarizing film contains zinc, 0.002 to 2 weight% is preferable and, as for content of zinc in a polarizing film, 0.01 to 1 weight% is more preferable.

It is preferable that the polarizing film further contains sulfate ions. When a polarizing film contains sulfate ion, there exists a tendency for the fall of the transmittance|permeability of the polarizing film laminated body after a heat test to be suppressed. When a polarizing film contains sulfate ion, 0.02 to 0.45 weight% is preferable, as for content of sulfate ion in a polarizing film, 0.05 to 0.35 weight% is more preferable, 0.1 to 0.25 weight% is still more preferable. In addition, content of the sulfate ion in a polarizing film is computed from sulfur atom content.

In order to contain zinc in a polarizing film, it is preferable that zinc impregnation process is performed in the manufacturing process of a polarizing film. In addition, in order to contain sulfate ion in a polarizing film, it is preferable that sulfate ion treatment is performed in the manufacturing process of a polarizing film.

The zinc impregnation treatment is performed, for example, by immersing the PVA-based film in a zinc salt solution. As a zinc salt, the inorganic salt compound of aqueous solutions, such as zinc halide, such as zinc chloride and zinc iodide, zinc sulfate, and zinc acetate, is suitable. In addition, various zinc complex compounds may be used for the zinc impregnation treatment. Moreover, it is easy to impregnate a zinc ion, and it is preferable to use the aqueous solution containing potassium ion and iodine ion with potassium iodide etc. as a zinc salt solution. The concentration of potassium iodide in the zinc salt solution is about 0.5 to 10% by weight, and preferably 1 to 8% by weight.

The sulfate ion treatment is performed, for example, by immersing the PVA-based film in an aqueous solution containing a metal sulfate salt. The metal sulfate salt is preferably one that is easily separated into sulfate ions and metal ions in the treatment solution and that the metal sulfate salt is easily introduced into the PVA-based film in the form of ions. For example, as a kind of metal which forms a metal sulfate, alkali metals, such as sodium and potassium; alkaline earth metals such as magnesium and calcium; Transition metals, such as cobalt, nickel, zinc, chromium, aluminum, copper, manganese, and iron, are mentioned.

In the production of the polarizing film, the zinc impregnation treatment and the sulfate ion treatment may be performed at any stage. That is, the zinc impregnation treatment and the sulfate ion treatment may be performed before the dyeing treatment or after the dyeing treatment. The zinc impregnation treatment and the sulfate ion treatment may be performed simultaneously. It is preferable that zinc impregnation treatment and sulfate ion treatment are performed simultaneously by using zinc sulfate as the zinc salt and the metal sulfate salt and immersing the PVA-based film in a treatment bath containing zinc sulfate. Moreover, the said zinc salt or the said metal sulfate salt is made to coexist in a dyeing solution, and a zinc impregnation treatment and/or a sulfate ion treatment can also be performed simultaneously with the dyeing|staining process. The zinc impregnation treatment and the sulfate ion treatment may be performed simultaneously with stretching.

2-2. Polarizing Film Protective Film

2-2-1. Polarizing film protective film located on the side opposite to the viewing side

In the polarizing film laminate 12 of FIG. 1 , as a material constituting the polarizing film protective film 122 positioned on the opposite side to the viewing side rather than the polarizing film 120 , for example, transparency, mechanical strength, and heat A thermoplastic resin excellent in stability is mentioned. Specific examples of such a thermoplastic resin include a cellulose-based resin such as triacetyl cellulose, a polyester-based resin, a polyethersulfone-based resin, a polysulfone-based resin, a polycarbonate-based resin, a polyamide-based resin, a polyimide-based resin, and a polyolefin-based resin. Resin, (meth)acrylic-type resin, cyclic polyolefin-type resin (norbornene-type resin), polyarylate-type resin, polystyrene-type resin, PVA-type resin, and these mixtures are mentioned.

The polarizing film protective film 122 may have both a function of a retardation film.

The thickness of the polarizing film protective film 122 is suitably adjusted in order to adjust the moisture content of a polarizing film laminated body. From the viewpoints of workability such as strength and handleability, and thin layer properties, the thickness is preferably about 1-500 µm, more preferably 2-300 µm, and still more preferably 5-200 µm.

In the polarizing film protective film 122, one or more types of arbitrary additives may be contained. As an additive, a ultraviolet absorber, antioxidant, a lubricant, a plasticizer, a mold release agent, a coloring inhibitor, a flame retardant, a nucleating agent, an antistatic agent, a pigment, a coloring agent etc. are mentioned, for example.

2-2-2. Polarizing film protective film located on the viewer side

In the polarizing film laminate 12 of FIG. 1 , the polarizing film protective film 121 positioned on the viewing side rather than the polarizing film 120 is constituted as a light absorption layer having light absorption ability, in other words, transmittance to ultraviolet rays. It is installed at this desired value. For example, by containing an ultraviolet absorber, the polarizing film protective film 121 can be configured as a light absorbing layer having light absorption ability. No need. For example, a desired transmittance may be obtained by using an ultraviolet absorption filter instead of the ultraviolet absorber. When only the polarizing film protective film 121 is used as the light absorption layer, for example, the transmittance at a wavelength of 380 nm is preferably 5% or less, more preferably 3% or less, and still more preferably 2% or less. The lower limit is, for example, 0.1% or more and 1% or more. 35 % or less is preferable, as for the transmittance|permeability in wavelength 390 nm, 30 % or less is more preferable, and its 28 % or less is still more preferable. The lower limit is, for example, 10% or more, 20% or more, or 25% or more. 70% or less is preferable and, as for the transmittance|permeability in wavelength 400nm, 68 % or less is more preferable. The lower limit is, for example, 50% or more, 60% or more, or 65% or more. The transmittance at a wavelength of 420 nm is preferably 90% or less. The lower limit is, for example, 80% or more and 85% or more. In addition to the ultraviolet absorber, infrared rays such as phthalocyanine light absorber, naphthalocyanine light absorber, polymethine light absorber, diphenylmethane light absorber, triphenylmethane light absorber, quinone light absorber, azo light absorber, etc. An absorbent may be mixed.

As the polarizing film protective film 121 , for example, the configuration shown in FIGS. 3A to 3C can be adopted. All of the polarizing film protective films 121A to C shown in FIGS. 3A to 3C can be used as the polarizing film protective film 121 shown in FIG. 1 . In addition, in addition to the polarizing film protective films 121A to C, the polarizing film 120 and the polarizing film protective film 122 shown in FIG. 1 are also shown in these figures for convenience.

(A) Polarizing film protective film (121A)

The polarizing film protective film 121A shown in FIG. 3A includes a polarizing film protective film layer 121A-1 and a coating layer 121A-2. The polarizing film protective film 121A having light absorption ability can be formed, for example, by containing a light absorbent in the polarizing film protective film layer 121A-1 and/or by containing a light absorbent in the coating layer 121A-2. .

Examples of the material constituting the polarizing film protective film layer 121A-1 include a thermoplastic resin excellent in transparency, mechanical strength, and thermal stability. Specific examples of such a thermoplastic resin include cellulose-based resins such as triacetyl cellulose, polyester-based resins, polyethersulfone-based resins, polysulfone-based resins, polycarbonate-based resins, polyamide-based resins, polyimide-based resins, polyolefin-based resins, (meth)acrylic-type resin, cyclic polyolefin-type resin (norbornene-type resin), polyarylate-type resin, polystyrene-type resin, PVA-type resin, and these mixtures are mentioned. A polarizing film protective film may have both the function of retardation film.

The thickness of the polarizing film protective film layer 121A-1 is suitably adjusted in order to adjust the moisture content of the polarizing film laminated body 12. It is 20-60 micrometers, Preferably it is 30-50 micrometers from points, such as workability, such as intensity|strength and handling property, and thin layer property.

One or more types of arbitrary additives may be contained in polarizing film protective film layer 121A-1. As an additive, antioxidant, a lubricant, a plasticizer, a mold release agent, a coloring inhibitor, a flame retardant, a nucleating agent, an antistatic agent, a pigment, a coloring agent, etc. are mentioned, for example.

Examples of the light absorber contained in the polarizing film protective film layer 121A-1 include a benzotriazole-based, benzophenone-based, salicylic acid phenyl ester-based, and triazine-based ultraviolet absorber. Examples of the benzotriazole-based UV absorber include 2-(5-methyl-2-hydroxyphenyl)benzotriazole, 2-(2H-benzotriazol-2-yl)-p-cresol, and 2-(2H-benzo triazol-2-yl)-4,6-di-tert-pentylphenol, 2-(2'-hydroxy-5'methacryloxyethylphenyl)-2H-benzotriazole, etc. are mentioned. Examples of the benzophenone-based UV absorber include 2-hydroxy-4-octoxybenzophenone, 2,4-dihydroxybenzophenone, 2-hydroxy-4-methoxy-4'-chlorbenzophenone, 2, 2-dihydroxy-4-methoxybenzophenone, 2,2-dihydroxy-4,4'-dimethoxybenzophenone, etc. are mentioned. As a salicylic acid phenyl ester type|system|group ultraviolet absorber, p-t- butylphenyl salicylic acid ester etc. are mentioned, for example. Examples of the triazine-based UV absorber include 2,4-diphenyl-6-(2-hydroxy-4-methoxyphenyl)-1,3,5-triazine, 2,4-diphenyl-6-(2). -Hydroxy-4-ethoxyphenyl)-1,3,5-triazine, 2,4-diphenyl-(2-hydroxy-4-propoxyphenyl)-1,3,5-triazine, 2 ,4-diphenyl-(2-hydroxy-4-butoxyphenyl)-1,3,5-triazine, 2,4-diphenyl-6-(2-hydroxy-4-butoxyphenyl)- 1,3,5-triazine, 2,4-diphenyl-6-(2-hydroxy-4-hexyloxyphenyl)-1,3,5-triazine, 2,4-diphenyl-6-( 2-hydroxy-4-octyloxyphenyl)-1,3,5-triazine, 2,4-diphenyl-6-(2-hydroxy-4-dodecyloxyphenyl)-1,3,5- Triazine, 2,4-diphenyl-6-(2-hydroxy-4-benzyloxyphenyl)-1,3,5-triazine, 2,4-diphenyl-6-(2-hydroxy-4 -Butoxyethoxyphenyl)-1,3,5-triazine, etc. can be used. These light absorbers can be contained by mixing in a polarizing film protective film.

Specific examples of the coating layer 121A-2 include a hard coat layer, an anti-glare layer, an anti-blocking layer, an anti-reflection layer, and a conductive layer. Especially, the manufacturing method of this invention is useful especially, when forming a hard-coat layer. Materials constituting the coating layer include resin materials (monomers, oligomers, prepolymers and/or polymers). In one embodiment, a thermosetting type or photocuring type curable compound is included as a resin material. When the material of the coating layer containing the curable compound is used, a hard coat layer or an anti-glare layer can be formed. The curable compound may be any of a monomer, an oligomer, and a prepolymer. A polyfunctional monomer or oligomer may be used as the curable compound, for example, a monomer or oligomer having two or more (meth)acryloyl groups, an oligomer of urethane (meth)acrylate or urethane (meth)acrylate, and an epoxy-based monomer or an oligomer, a silicone-based monomer, or an oligomer.

The thickness of the coating layer 121A-2 is 10 µm or less, preferably 8 µm or less, and more preferably 6 µm or less in terms of thin layer properties and the like. The lower limit is, for example, 1 µm or more, 2 µm or more, or 4 µm or more.

Examples of the light absorber contained in the coating layer 121A-2 include a benzotriazole-based, benzophenone-based, salicylic acid phenyl ester-based, and triazine-based ultraviolet absorber. Examples of the benzotriazole-based UV absorber include 2-(5-methyl-2-hydroxyphenyl)benzotriazole, 2-(2H-benzotriazol-2-yl)-p-cresol, and 2-(2H-benzo triazol-2-yl)-4,6-di-tert-pentylphenol, 2-(2'-hydroxy-5'methacryloxyethylphenyl)-2H-benzotriazole, etc. are mentioned. Examples of the benzophenone-based UV absorber include 2-hydroxy-4-octoxybenzophenone, 2,4-dihydroxybenzophenone, 2-hydroxy-4-methoxy-4'-chlorbenzophenone, 2, 2-dihydroxy-4-methoxybenzophenone, 2,2-dihydroxy-4,4'-dimethoxybenzophenone, etc. are mentioned. As a salicylic acid phenyl ester type|system|group ultraviolet absorber, p-t- butylphenyl salicylic acid ester etc. are mentioned, for example. As the triazine-based UV absorber, for example, 2,4-diphenyl-6-(2-hydroxy-4-methoxyphenyl)-1,3,5-triazine, 2,4-diphenyl-6-(2) -Hydroxy-4-ethoxyphenyl)-1,3,5-triazine, 2,4-diphenyl-(2-hydroxy-4-propoxyphenyl)-1,3,5-triazine, 2 ,4-diphenyl-(2-hydroxy-4-butoxyphenyl)-1,3,5-triazine, 2,4-diphenyl-6-(2-hydroxy-4-butoxyphenyl)- 1,3,5-triazine, 2,4-diphenyl-6-(2-hydroxy-4-hexyloxyphenyl)-1,3,5-triazine, 2,4-diphenyl-6-( 2-hydroxy-4-octyloxyphenyl)-1,3,5-triazine, 2,4-diphenyl-6-(2-hydroxy-4-dodecyloxyphenyl)-1,3,5- Triazine, 2,4-diphenyl-6-(2-hydroxy-4-benzyloxyphenyl)-1,3,5-triazine, 2,4-diphenyl-6-(2-hydroxy-4 -Butoxyethoxyphenyl)-1,3,5-triazine, etc. can be used. These light absorbers can be contained by mixing with resin which forms a coating layer.

In order to achieve the transmittance, the total thickness as a light absorption layer constituted by the polarizing film protective film layer 121A-1 and/or the coating layer 121A-2, that is, the polarizing film protective film layer 121A- 1), and/or the total thickness of the coating layer 121A-2 having light absorption ability is 25 to 65 μm, preferably 35 to 55 μm or less, more preferably from the viewpoint of obtaining sufficient light absorption ability and thin layer properties. is 40-50 μm.

(B) Polarizing film protective film (121B)

The polarizing film protective film 121B shown in FIG.3(b) is several, here two polarizing film protective film layers 121B-1, 121B-3, these polarizing film protective film layers 121B-1, and an adhesive layer 121B-2 for bonding 121B-3). The polarizing film protective film 121B having light absorption ability can be formed, for example, by containing a light absorber in either or both of the polarizing film protective film layers 121B-1 and 121B-3.

As a material constituting the polarizing film protective film layers 121B-1 and 121B-3, the same material as the optical film protective film layer 121A-1 can be used.

In addition, as the light absorber contained in the polarizing film protective film layers 121B-1 and 121B-3, the same light absorber contained in the polarizing film protective film layer 121A-1 can be used. These light absorbers may be contained in the same manner as in the polarizing film protective film layer 121A-1.

In order to achieve the transmittance, the total thickness as a light absorption layer constituted by the polarizing film protective film layers 121B-1 and 121B-3, that is, the polarizing film protective film layers 121B-1 and 121B-3 having light absorption ability. The total thickness of the is 25 to 105 µm, preferably 60 to 100 µm, more preferably 70 to 90 µm from the viewpoint of obtaining sufficient light absorbing power and thinness.

As the adhesive layer 121B-2, for example, an ultraviolet curing adhesive or a dope curing adhesive, which will be described later, can be used.

(C) Polarizing film protective film (121C)

The polarizing film protective film 121C shown in FIG. 3C includes only the polarizing film protective film layer 121C having light absorption ability.

As a material constituting the polarizing film protective film layer 121C, the same material as the optical film protective film layer 121A-1 can be used.

In addition, as the light absorber contained in the polarizing film protective film layer 121C, the same light absorber contained in the polarizing film protective film layer 121A-1 can be used. These light absorbers may be contained in the same manner as in the polarizing film protective film layer 121A-1.

The thickness of the polarizing film protective film layer 121C, that is, the thickness as a light absorption layer, is 25 to 105 µm, preferably 60 to 100 µm, more preferably 70 to 90 µm, from the viewpoint of obtaining sufficient light absorption ability and thin layer properties. am. In addition, the polarizing film protective film layer 121C may be regarded as an integrated one of the plurality of polarizing film protective films 121B-1 and 121B-3 shown in FIG. 3B .

2-2-3. etc

The light absorption layer may be formed using any of the cover plate 14 , the transparent adhesive 13 , and the polarizing film protective film 121 , or by combining them. When a light absorption layer is formed by combining a plurality of layers, as in a general device, the desired transmittance may be appropriately adjusted as a whole device.

2-3. other optical films

The polarizing film and the polarizing film protective films 121 and 122 may be directly bonded, or may be laminated with another optical film. Although limitation in particular is not carried out about another optical film, For example, retardation film, a viewing angle compensation film, etc. can be used. The retardation film as another optical film may have a function as a protective film.

As described above, the polarizing film protective films 121 and 122 may function as a retardation film, but in this case, the retardation film as another optical film may be omitted. On the other hand, even when a polarizing film protective film has the function of retardation film, retardation film can also be formed as another optical film. In this case, substantially two or three or more retardation films are included.

2-4. glue

An adhesive used for bonding the adhesive layer 121B-2 shown in FIG. 3B , the polarizing film 120 and the polarizing film protective films 121 and 122, or another optical film such as a retardation film and their For bonding, for example, a radical polymerization curing type (ultraviolet curing type) adhesive, a cation polymerization curing type adhesive, or a water-based (doping type) adhesive can be used.

(Radical polymerization curing adhesive)

The said radical polymerization curable adhesive contains a radically polymerizable compound as a sclerosing|hardenable compound. The radically polymerizable compound may be a compound hardened by an active energy ray, or a compound hardened by a heat|fever may be sufficient as it. As an active energy ray, an electron beam, an ultraviolet-ray, a visible ray etc. are mentioned, for example.

As said radically polymerizable compound, the compound which has a radically polymerizable functional group which has carbon-carbon double bonds, such as a (meth)acryloyl group and a vinyl group, is mentioned, for example. As the radically polymerizable compound, a polyfunctional radically polymerizable compound is preferably used. A radically polymerizable compound may be used individually by 1 type, and may be used in combination of 2 or more type. Moreover, you may use together a polyfunctional radically polymerizable compound and a monofunctional radically polymerizable compound.

It is preferable to use a compound with a high logP value (octanol/water partition coefficient) as said polymeric compound, and it is preferable to select a compound with a high logP value also as a radically polymerizable compound. Here, the logP value is an index indicating the lipophilicity of a substance, and means a logarithmic value of the partition coefficient of octanol/water. A high logP value means lipophilicity, that is, a low absorption rate. The logP value can also be measured (flask penetration method described in JIS-Z-7260), and calculated based on the structure of each compound that is a component (curable component, etc.) of the curable adhesive (ChemDraw Ultra manufactured by Cambridge Soft Co., Ltd.) )You may.

2 or more are preferable, as for the logP value of a radically polymerizable compound, 3 or more are more preferable, 4 or more are especially preferable. If it is such a range, deterioration by moisture of a polarizer can be prevented, and the polarizing film excellent in durability under high temperature, high humidity can be obtained.

Examples of the polyfunctional radically polymerizable compound include tripropylene glycol di(meth)acrylate, tetraethylene glycol di(meth)acrylate, 1,6-hexanediol di(meth)acrylate, 1,9-no Nandiol di(meth)acrylate, 1,10-decanediol diacrylate, 2-ethyl-2-butylpropanediol di(meth)acrylate, bisphenol A di(meth)acrylate, bisphenol A ethylene oxide adduct di (meth)acrylate, bisphenol A propylene oxide adduct di(meth)acrylate, bisphenol A diglycidyl ether di(meth)acrylate, neopentyl glycol di(meth)acrylate, tricyclodecane dimethanol di( meth) acrylic, cyclic trimethylol propane formal (meth) acrylate, dioxane glycol di (meth) acrylate, trimethylol propane tri (meth) acrylate, pentaerythritol tri (meth) acrylate, pentaerythritol Ester products of (meth)acrylates such as tetra(meth)acrylate, dipentaerythritol penta(meth)acrylate, dipentaerythritol hexa(meth)acrylate, and EO-modified diglycerin tetra(meth)acrylate and polyhydric alcohol ; 9,9-bis[4-(2-(meth)acryloyloxyethoxy)phenyl]fluorene; epoxy (meth)acrylate; urethane (meth)acrylate; Polyester (meth)acrylate etc. are mentioned.

Among the said polyfunctional radically polymerizable compound, the polyfunctional radically polymerizable compound with a high logP value is preferable. As such a compound, For example, alicyclic (meth)acrylates, such as tricyclodecane dimethanol di(meth)acrylic (logP=3.05) and isobornyl (meth)acrylate (logP=3.27); long-chain aliphatic (meth)acrylates such as 1,9-nonanediol di(meth)acrylate (logP=3.68) and 1,10-decanediol diacrylate (logP=4.10); multi-branched (meth)acrylates such as hydroxypivalic acid neopentyl glycol (meth)acrylic acid adduct (logP=3.35) and 2-ethyl-2-butylpropanediol di(meth)acrylate (logP=3.92); Bisphenol A di(meth)acrylate (logP=5.46), bisphenol A ethylene oxide 4 moles di(meth)acrylate (logP=5.15), bisphenol A propylene oxide 2 moles adduct di(meth)acrylate (logP) = 6.10), bisphenol A propylene oxide 4-molar adduct di(meth)acrylate (logP=6.43), 9,9-bis[4-(2-(meth)acryloyloxyethoxy)phenyl]fluorene ( (meth)acrylate containing aromatic rings, such as logP=7.48) and p-phenylphenol (meth)acrylate (logP=3.98), etc. are mentioned.

When a polyfunctional radically polymerizable compound and a monofunctional radically polymerizable compound are used together, the content ratio of the polyfunctional radically polymerizable compound is preferably 20 to 97% by weight, and 50 to 95% by weight based on the total amount of the radically polymerizable compound. More preferably, 75 to 92% by weight is more preferable, and particularly preferably 80 to 92% by weight. If it is such a range, the polarizing film excellent in the durability under high temperature, high humidity can be obtained.

As said monofunctional radically polymerizable compound, the (meth)acrylamide derivative which has a (meth)acrylamide group is mentioned, for example. When the (meth)acrylamide derivative is used, a pressure-sensitive adhesive layer having excellent adhesion can be formed with high productivity. Specific examples of the (meth)acrylamide derivative include, for example, N-methyl (meth)acrylamide, N,N-dimethyl (meth)acrylamide, N,N-diethyl (meth)acrylamide, N-isopropyl ( N-alkyl group-containing (meth)acrylamide derivatives, such as meth)acrylamide, N-butyl (meth)acrylamide, and N-hexyl (meth)acrylamide; N-hydroxyalkyl group-containing (meth)acrylamide derivatives such as N-methylol (meth)acrylamide, N-hydroxyethyl (meth)acrylamide, and N-methylol-N-propane (meth)acrylamide; N-aminoalkyl group-containing (meth)acrylamide derivatives such as aminomethyl (meth)acrylamide and aminoethyl (meth)acrylamide; N-alkoxy group-containing (meth)acrylamide derivatives such as N-methoxymethylacrylamide and N-ethoxymethylacrylamide; N-mercaptoalkyl group-containing (meth)acrylamide derivatives, such as mercaptomethyl (meth)acrylamide and mercaptoethyl (meth)acrylamide, etc. are mentioned. Moreover, as a heterocyclic-containing (meth)acrylamide derivative in which the nitrogen atom of the (meth)acrylamide group forms a heterocycle, for example, N-acryloylmorpholine, N-acryloylpiperidine, N-meth You may use acryloylpiperidine, N-acryloylpyrrolidine, etc. Among these, an N-hydroxyalkyl group containing (meth)acrylamide derivative is preferable, and N-hydroxyethyl (meth)acrylamide is more preferable.

In addition, as the monofunctional radically polymerizable compound, a (meth)acrylic acid derivative having a (meth)acryloyloxy group; carboxyl group-containing monomers such as (meth)acrylic acid, carboxyethyl acrylate, carboxypentyl acrylate, itaconic acid, maleic acid, fumaric acid, crotonic acid, and isocrotonic acid; lactam-based vinyl monomers such as N-vinylpyrrolidone, N-vinyl-ε-caprolactam and methylvinylpyrrolidone; A vinyl monomer having a nitrogen-containing heterocycle such as vinyl pyridine, vinyl piperidone, vinyl pyrimidine, vinyl piperazine, vinyl pyrazine, vinyl pyrrole, vinyl imidazole, vinyl oxazole, or vinyl morpholine may be used.

When a polyfunctional radically polymerizable compound and a monofunctional radically polymerizable compound are used together, the content ratio of the monofunctional radically polymerizable compound is preferably from 3 to 80% by weight, and from 5 to 50% by weight with respect to the total amount of the radically polymerizable compound. It is more preferable, 8 to 25 weight% is still more preferable, and 8 to 20 weight% is especially preferable. If it is such a range, the polarizing film excellent in the durability under high temperature, high humidity can be obtained.

The radical polymerization curing adhesive may further include other additives. When the radical polymerization curable adhesive includes a curable compound cured by active energy rays, the adhesive may further include, for example, a photopolymerization initiator, a photoacid generator, a silane coupling agent, and the like. In addition, when the radical polymerization curable adhesive includes a curable compound cured by heat, the adhesive may further include a thermal polymerization initiator, a silane coupling agent, and the like. Moreover, as another additive, a polymerization inhibitor, a polymerization initiator adjuvant, a leveling agent, a hygroscopicity improving agent, surfactant, a plasticizer, a ultraviolet absorber, an inorganic filler, a pigment, dye etc. are mentioned, for example.

(Cation polymerization curing adhesive)

The said cation polymerization curable adhesive agent contains a cationically polymerizable compound as a sclerosing|hardenable compound. As a cationically polymerizable compound, the compound which has an epoxy group and/or oxetanyl group is mentioned, for example. As for the compound which has an epoxy group, the compound which has at least 2 epoxy groups in a molecule|numerator is used preferably. As a compound having an epoxy group, for example, a compound having at least two epoxy groups and at least one aromatic ring (aromatic epoxy compound), having at least two epoxy groups in the molecule, at least one of which constitutes an alicyclic ring The compound (alicyclic epoxy compound) etc. which are formed between two adjacent carbon atoms are mentioned.

The cationic polymerization curable adhesive preferably includes a photocationic polymerization initiator. A photocationic polymerization initiator generates a cationic species or a Lewis acid by irradiation of active energy rays such as visible light, ultraviolet light, X-ray, or electron beam, and initiates a polymerization reaction of an epoxy group or an oxetanyl group. In addition, the cationic polymerization curing adhesive may further include the above additives.

(water-based adhesive)

As the water-based adhesive, for example, an aqueous solution of a water-based adhesive such as an isocyanate-based adhesive, a PVA-based adhesive, a gelatin-based adhesive, a vinyl-based latex, or a water-based polyester (for example, a solid content concentration of 0.5 to 60% by weight) is suitably used. do.

Application|coating of an adhesive agent may be performed by any of the polarizing film 120, the polarizing film protective films 121, 122, and another optical film, and may be performed to either of them. Generally, after immersing a polarizing film in the adhesive agent aqueous solution, the method of laminating|stacking with the polarizing film protective films 121 and 122 by a roll laminator etc. is suitable. Although the thickness in particular of a contact bonding layer is not restrict|limited, For example, it is about 30 nm - 1000 nm in thickness after drying.

After the polarizing film, the polarizing film protective film, and other optical films are laminated via an adhesive, this laminate is subjected to a drying treatment. In the drying process of this laminated body, in addition to the objective of drying and solidifying an adhesive agent, it is performed for the objective of reducing the moisture content which improves the initial stage optical characteristic of a polarizing film laminated body. As a drying method, heat drying is common. As drying conditions, Preferably the range of 50-95 degreeC and the range of 60-85 degreeC are more preferable.

Although the drying conditions of the said laminated body are not specifically limited, Considering efficiency and practicality of a process, it is preferable that a drying temperature is 50 degreeC or more, From a viewpoint of making the optical characteristic of a polarizing film laminated body uniform, 95 degrees C or less is preferable. Do. The drying temperature may be carried out by raising the temperature stepwise within the above temperature range.

Drying of a laminated body can be performed continuously with the bonding process of a polarizing film, a polarizing film protective film, and another optical film. Moreover, after winding the laminated body of a polarizing film, a polarizing film protective film, and another optical film in roll state once, drying may be performed as another process.

Generally, in order to make small the moisture content of a polarizing film laminated body, high temperature and long-time drying conditions are needed. Although drying for a high temperature and a long time is preferable from a viewpoint of the fall of the water content of a polarizing film laminated body, on the other hand, it may lead to the fall of optical properties, etc. of a polarizing film laminated body. By using a polarizing film protective film having a small saturated absorption amount or a polarizing film protective film having a high water vapor transmission rate, the moisture content of the polarizing film laminate can be adjusted to the desired range even if severe drying conditions are not employed.

2-5. adhesive

“1-3. The adhesive described in "Transparent Adhesive" can be used similarly.

3. Reliability evaluation items

A plurality of phenomena that may occur in the polarizing film laminate, ie, polyenization, color loss, and heat redness are evaluated. Although the mechanism by which each phenomenon arises is not necessarily clear, it is estimated that it is roughly as follows.

<Polyenization>

Under a high-temperature, high-humidity environment, the single transmittance|permeability of a polarizing film laminated body falls. Moreover, the single transmittance of a polarizing film laminated body falls similarly also in light irradiation in an ultraviolet region or a visible region. This decrease is presumed to be due to polyenization of PVA. Polyene refers to -(CH=CH) _n- , and can be formed in a polarizing film by heating or light energy. Polyene significantly lowers the transmittance of the polarizing film. In addition, under a high-temperature, high-humidity environment, but under a light irradiation environment in an ultraviolet region and a visible light region, the PVA-polyiodine complex is destroyed and I ⁻ and I ₂ are easily generated.

Polyenization of PVA is, as shown in the following formula (1), dehydration reaction is accelerated by iodine (I ₂ ) generated in a high temperature and high humidity environment, or under light irradiation environment in the ultraviolet region or visible region, and heating or light energy. is believed to be happening.

(Formula 1)

I ₂ generated when the PVA-polyiodine complex present in the polarizing film is destroyed by heating or light energy and the OH group in PVA form a charge transfer complex (HO...I ₂ ), and then pass through the OI group to form polyiodine I think it is yen.

<color loss>

In the PVA-based film (polarizing film) dyed and stretched with iodine, iodine is in the form of polyiodine ions of I ₃ ⁻ and I ₅ ⁻ and forms a complex with the oriented PVA (PVA polyiodine complex) . At this time, in PVA, a crosslinking point is formed with crosslinking agents, such as boric acid, and the orientation is maintained by this.

However, when the polarizing film is placed under a light irradiation environment in the ultraviolet region or visible region at high temperature and high humidity, hydrolysis of boric acid crosslinking occurs, the orientation of PVA decreases, and the PVA polyiodine complex collapses. Thereby, the visible light absorption based on a PVA polyiodine complex falls, and the transmittance|permeability of about 700 nm long wavelength side and a short wavelength side of about 410 nm rises. In this way, color loss in black display occurs in the polarizing film placed under the light irradiation environment in the ultraviolet region or visible region at high temperature and high humidity.

<Heated redness>

In the iodine-dyed and stretched PVA-based film (polarizing film), iodine forms a complex with PVA in the form of polyiodine ions of I ₃ ⁻ and I ₅ ⁻ (PVA polyiodine complex). I ₃ ⁻ has a broad absorption peak near 470 nm, and I ₅ ⁻ has a broad absorption peak near 600 nm. That is, the PVA-I ₃ ⁻ complex is responsible for absorption on the short wavelength side (blue side), and the PVA-I ₅ ⁻ complex is responsible for absorption on the long wavelength side (red side).

However, this PVA-I ₅ ^- complex is weak to heating and light energy, and the polarizing film is high in temperature, but when placed under a light irradiation environment in the ultraviolet region or visible light region, the complex formation of PVA and I ₅ ^- collapses, and I ₅ ^- decomposes

Therefore, in a polarizing film placed under a light irradiation environment in the ultraviolet region or visible region at a high temperature, the PVA-I ₅ ⁻ complex responsible for absorption on the long wavelength side decreases, that is, the transmittance on the long wavelength side of about 700 nm. This rises, and the polarizing film is discolored red.

4. Examples and Comparative Examples

Hereinafter, although an Example is demonstrated together with a comparative example, of course, this invention is not limited to what was described in these Examples.

As Examples and Comparative Examples, "film thickness (μm) of polarizing film", and/or "iodine concentration of polarizing film (wt.%)", and/or "water content of polarizing film laminate (g/m2)" , the samples of the various polarizing film laminates from which "transmittance" with respect to the light of short wavelength (380 micrometers etc.) differ were prepared.

<Thickness of polarizing film>

The film thickness (µm) of the polarizing film is measured using a spectroscopic film thickness meter MCPD-1000 (manufactured by Otsuka Electronics Co., Ltd.). The thickness of a polarizing film protective film is also measured using this. The polarizing film contained in the sample can be taken out by immersing the sample in a solvent and dissolving the polarizing film protective film. For the solvent, for example, dichloromethane when the polarizing film protective film is a triacetyl cellulose resin, cyclohexane when the polarizing film protective film is a cycloolefin resin, and methylethyl when the polarizing film protective film is an acrylic resin Each of the ketones may be used. In addition, when the resin of the polarizing film protective film formed on one surface of the polarizing film and the resin of the polarizing film protective film formed on the other surface of the polarizing film are different, each resin is sequentially prepared using the solvent described above. Dissolve.

<Iodine Concentration of Polarizing Film>

The iodine concentration (wt.%) of the polarizing film can be changed by, for example, adjusting the concentration and immersion time of the iodine aqueous solution in which the PVA-based film or PVA layer is immersed in the production of the polarizing film.

The iodine concentration of the polarizing film is measured by the following method. In addition, similarly to the case of measuring the film thickness of a polarizing film, the polarizing film contained in a sample can be taken out by immersing a sample in a solvent and dissolving a polarizing film protective film.

(fluorescence X-ray measurement)

When measuring the iodine concentration of a polarizing film, first, the iodine concentration is quantified using the calibration curve method of fluorescence X-ray analysis. As the apparatus, a fluorescent X-ray analyzer ZSX-PRIMUS IV (manufactured by Rigaku Co., Ltd.) is used.

The value obtained directly by the fluorescence X-ray analyzer is not the concentration of each element, but the fluorescence X-ray intensity (kcps) of a wavelength unique to each element. Therefore, in order to obtain the concentration of iodine contained in the polarizing film, it is necessary to convert the intensity of the fluorescence X-ray into the concentration using a calibration curve. The iodine concentration of the polarizing film in this specification and the like means the iodine concentration (wt%) based on the weight of the polarizing film.

(Creation of calibration curve)

A calibration curve should be prepared in the following order.

1. A known amount of potassium iodide was dissolved in an aqueous PVA solution to prepare seven PVA aqueous solutions containing iodine having a known concentration. This PVA aqueous solution is applied and dried on polyethylene terephthalate, and then peeled to prepare samples 1 to 7 of PVA films containing iodine having a known concentration.

In addition, the iodine density|concentration (wt%) of a PVA film is computed by the following formula (1).

[Formula 1] Iodine concentration (wt%) = {Potassium iodide amount (g) / (Potassium iodide amount (g) + PVA amount (g))} × (127/166)

(Molecular weight of iodine: 127 Molecular weight of potassium: 39)

2. About the produced PVA film, the fluorescent X-ray intensity (kcps) corresponding to an iodine is measured using the X-ray fluorescence analyzer ZSX-PRIMUS IV (made by Rigaku Co., Ltd.). In addition, let the fluorescent X-ray intensity (kcps) be the peak value of a fluorescent X-ray spectrum. In addition, the film thickness of the produced PVA film is measured using spectroscopic film thickness meter MCPD-1000 (made by Otsuka Electronics Co., Ltd.).

3. The fluorescent X-ray intensity is divided by the thickness (µm) of the PVA film, and the fluorescent X-ray intensity per unit thickness of the film (kcps/µm) is used. Table 1 shows the iodine concentration of each sample and the fluorescence X-ray intensity per unit thickness.

4. Based on the results shown in Table 1, a calibration curve is prepared with the fluorescence X-ray intensity (kcps/㎛) per unit thickness of the PVA film as the horizontal axis and the iodine concentration (wt%) contained in the PVA film as the vertical axis . The created calibration curve is shown in FIG. From the calibration curve, the formula for calculating the iodine concentration from the fluorescence X-ray intensity per unit thickness of the PVA film is determined as in Equation 2. In addition, R2 in FIG. 4 is a correlation coefficient.

[Equation 2] (Iodine concentration) (wt%) = 14.474 × (fluorescence X-ray intensity per unit thickness of PVA film) (kcps/㎛)

(Calculation of iodine concentration)

The fluorescent X-ray intensity obtained by the sample measurement is divided by the thickness to determine the fluorescent X-ray intensity per unit thickness (kcps/µm). The iodine concentration is calculated by substituting the fluorescence X-ray intensity per unit thickness of each sample into Equation 2.

<Moisture content of polarizing film laminate>

The moisture content (g/m 2 ) of the polarizing film laminate can be mainly determined by adjusting the film thickness of the polarizing film or the material, thickness, and the like of the polarizing film protective film to be bonded to the polarizing film. Moreover, it can adjust also by the crosslinking process (boric acid content, etc.) at the time of manufacture of a polarizing film.

The water content of a polarizing film laminated body is measured with the following method.

First, the polarizing film laminated body obtained by the Example and the comparative example is cut into the square of 0.1 m x 0.1 m.

The cut sample is put into a constant temperature and humidity chamber, and left to stand for 48 hours under an environment of 23°C and 55% relative humidity. Thereafter, the sample is taken out in the same environment as in the constant temperature and humidity chamber, that is, in a clean room set at a temperature of 23° C. and a relative humidity of 55%, and the weight is measured within 5 minutes after taking it out. Let the sample weight at this time be the initial weight (W1 (g)). In addition, within approximately 15 minutes after withdrawal, even if the temperature in the clean room fluctuates by about 2°C to 3°C or the relative humidity in the cleanroom fluctuates by about ±10%, the initial weight is not substantially affected. .

Next, the taken out sample is thrown into a dryer, and it is dried at 120 degreeC for 2 hours. Thereafter, the dried sample is taken out from the clean room set at the above-described temperature of 23° C. and relative humidity of about 55%, and the weight is measured within 10 minutes after withdrawal. The weight of the sample at this time is equal to the weight after drying (W2 (g)). Contrary to the above, the cooling time was taken into consideration when it was set to within 10 minutes instead of within 5 minutes. In addition, similarly to the above, if within about 15 minutes after withdrawal, there is no substantial influence on the weight after drying.

From the initial weight (W1) of the sample obtained in this way, and the weight (W2) after drying, the equilibrium moisture content (M(g/m<2>)) of a polarizing film laminated body is computed from a following formula.

(Formula) M=(W1-W2)/(0.1×0.1)

The "moisture content of a polarizing film laminated body" as used in this invention means the equilibrium moisture content calculated by the said method.

<Light absorption capacity>

In order to evaluate the effect of suppressing the effect of short-wavelength light, for each wavelength of 380 μm, 390 μm, 400 μm, and 420 μm, according to the JIS-Z-8701 color display method, the The transmittance of the polarizing film protective film was measured. U-4100 manufactured by Hitachi, Ltd. was used for the measurement.

[Example 1]

(Creation of polarizing film)

As the resin substrate, a long amorphous isophthalic copolymerized polyethylene terephthalate film (isophthalic acid group modified degree 5 mol%, thickness: 100 µm) was used. (degree of modification = ethylene isophthalate unit / (ethylene terephthalate unit + ethylene isophthalate unit)) Corona treatment (treatment conditions: 55 W min/m 2 ) is performed on one surface of the resin substrate, and this corona treatment surface PVA (degree of polymerization 4200, degree of saponification 99.2 mol%) 90 parts by weight and acetoacetyl-modified PVA (manufactured by Nippon Kosei Chemical Industry Co., Ltd., trade name "Kosei Firer Z410") 10 parts by weight of PVA and 13 parts by weight relative to PVA An aqueous solution containing potassium iodide was applied at room temperature. Then, it dried at 60 degreeC, the 13-micrometer-thick PVA type resin layer was formed, and the laminated body was produced.

The free-end uniaxial stretching of the obtained laminated body was carried out by 2.4 times in the longitudinal direction (longitudinal direction) between rolls with different circumferential speeds in 130 degreeC oven (air-assisted stretching).

Next, the laminate was immersed in an insolubilization bath (a boric acid aqueous solution obtained by blending 4 parts by weight of boric acid with respect to 100 parts by weight of water) at a liquid temperature of 40°C for 30 seconds (insolubilization treatment).

Next, it was immersed in a dyeing bath (aqueous iodine solution obtained by mixing iodine and potassium iodide in a weight ratio of 1:7 with respect to 100 parts by weight of water) at a liquid temperature of 30°C while adjusting the concentration so as to achieve a specified transmittance for 60 seconds (dyeing) process).

Then, it was made to immerse for 30 second in the crosslinking bath (boric acid aqueous solution obtained by mix|blending 3 weight part of potassium iodide with respect to 100 weight part of water, and mix|blending 5 weight part of boric acid) at a liquid temperature of 40 degreeC (crosslinking process).

Thereafter, while the laminate was immersed in a boric acid aqueous solution (boric acid concentration of 3.0 wt%) at a liquid temperature of 70°C, uniaxial stretching was performed between rolls having different peripheral speeds so that the total draw ratio in the longitudinal direction (longitudinal direction) was 5.5 times (under water). stretching).

Then, the laminated body was immersed in the washing|cleaning bath (aqueous solution obtained by mix|blending 4 weight part of potassium iodide with respect to 100 weight part of water) with a liquid temperature of 20 degreeC (washing process).

Then, while drying (drying process) in the oven maintained at 90 degreeC, it was made to contact with the metal roll made from SUS whose surface temperature was maintained at 75 degreeC for 2 seconds or more (hot roll drying process).

In this way, a polarizing film having a thickness of 5.4 µm was obtained on the resin substrate.

(Creation of a polarizing film laminated body)

A polarizing film protective film was not formed on the surface of the obtained polarizing film on the opposite side to the resin substrate (one surface of the polarizing film, in other words, the surface on the opposite side to the viewing side of the polarizing film), on the other hand, the surface from which the resin substrate was peeled (polarized light) On the other side of the film, in other words, the surface on the viewing side of the polarizing film), a triacetyl cellulose film (manufactured by Konica Minolta, trade name "KC4UY", thickness 40 µm) containing a light absorbent as a polarizing film protective film having light absorption ability; , a polarizing film protective film composed of a hard coat layer (thickness 5 µm) containing a light absorber disposed on the visual recognition side was bonded together via an ultraviolet curable adhesive to be described later. Specifically, it applied so that the total thickness of a curable adhesive might be set to 1.0 micrometer, and it joined using the roll machine. Thereafter, UV rays were irradiated from the other surface side to cure the adhesive, and a polarizing film laminate comprising a polarizing film and a polarizing film protective film having light absorption ability on the other surface of the polarizing film was obtained.

The above-mentioned triacetyl cellulose film contains a predetermined amount of a light absorbent (ultraviolet absorber). On the other hand, in the hard coat layer, Tinosorb S (manufactured by BASF), a light absorber, was contained in the triacetyl cellulose film and the entire hard coat layer so as to achieve the transmittances described in the absorption capacity of Tables 2 and 3 to be described later.

The detail of an ultraviolet curing adhesive is as follows. 40 parts by weight of N-hydroxyethylacrylamide (HEAA), 60 parts by weight of acryloylmorpholine (ACMO), and 3 parts by weight of a photoinitiator "IRGACURE 819" (manufactured by BASF) were mixed to prepare an adhesive. It applied on a polarizing film so that the thickness of the adhesive bond layer after hardening might be set to 1.0 micrometer, and ultraviolet-ray was irradiated as an active energy ray, and the adhesive agent was hardened. Ultraviolet irradiation was performed using a gallium encapsulated metal halide lamp, irradiation device: Light HAMMER10 manufactured by Fusion UV Systems, Inc., valve: V valve, peak illuminance: 1600 mW/cm2, cumulative irradiation amount 1000/mJ/cm2 (wavelength 380-440 nm). , UV illuminance was measured using Solatell's Sola-Check system.

(Measurement of iodine concentration)

By using cyclohexane as a solvent, the polarizing film was taken out from the polarizing film laminated body, and the iodine concentration of the polarizing film was measured.

(Measurement of transmittance)

The polarizing film protective film located on the visual recognition side rather than the polarizing film from the polarizing film laminate, that is, the polarizing film protective film which consists of a triacetyl cellulose film and a hard-coat layer was peeled, and the transmittance|permeability of the polarizing film protective film was measured.

[Example 2]

At the time of preparation of the polarizing film of Example 1, the iodine concentration was changed by adjusting the density|concentration and immersion time of the iodine aqueous solution in a dyeing process.

In addition, at the time of creation of the polarizing film laminated body of Example 1, as a polarizing film protective film, on one side of a polarizing film, a cycloolefin type film (Nippon Zeon Co., Ltd. make, Zeonoa film, 13 micrometers) was bonded through an ultraviolet curable adhesive. made it Since this cycloolefin film is formed on one surface of a polarizing film, it does not affect the value of light absorption capacity. In addition, the other surface of the polarizing film was set as the structure similar to the said other surface of Example 1. Moreover, the moisture content of the polarizing film laminated body was changed.

Other than that, it is the same as that of Example 1.

[Comparative Example 1]

In the preparation of the polarizing film laminate of Example 1, one side of the polarizing film has the same configuration as the one side of Example 1, and on the other hand, the other side of the polarizing film is a modified acrylic polymer having a lactone ring structure. A transparent protective film (manufactured by Nitto Denko Co., Ltd.) having a thickness of 20 µm was bonded together through an ultraviolet curable adhesive so that the total thickness of the curable adhesive was 1.0 µm in the same manner as in Example 1. Moreover, the moisture content of the polarizing film laminated body was changed.

Other than that, it is the same as that of Example 1.

[Comparative Example 2]

At the time of preparation of the polarizing film laminate of Example 2, one side of a polarizing film shall have the same structure as the said one side of Example 2, On the other hand, on the other side of a polarizing film, a cycloolefin type film (made by Nippon Zeon Corporation, Zeonoa film, 25 µm) was bonded through an ultraviolet curable adhesive so that the total thickness of the curable adhesive was 1.0 µm in the same manner as in Example 1. Moreover, the moisture content of the polarizing film laminated body was changed.

Other than that, it is the same as that of Example 2.

[Comparative Example 3]

At the time of preparation of the polarizing film of Example 1, the iodine concentration was changed by adjusting the density|concentration and immersion time of the iodine aqueous solution in a dyeing process.

In addition, at the time of creation of the polarizing film laminated body of Example 1, as a polarizing film protective film, on one side of a polarizing film, a cycloolefin type film (Nippon Zeon company make, Zeonoa film, 17 micrometers) was applied similarly to Example 1 It was bonded through an ultraviolet curing adhesive so that the total thickness of the curable adhesive was 1.0 μm. In addition, the other surface of the polarizing film was set as the structure similar to the said other surface of Example 1. Moreover, the moisture content of the polarizing film laminated body was changed.

Other than that, it is the same as that of Example 1.

[Comparative Example 4]

At the time of creation of the polarizing film laminated body of the comparative example 3, one surface of a polarizing film was set as the structure similar to the said one surface of the comparative example 3. On the other hand, no polarizing film protective film was formed on the other surface of the polarizing film. Moreover, the moisture content of the polarizing film laminated body was changed.

Other than that, it is the same as that of Comparative Example 3.

[Example 3]

(Creation of polarizing film)

The average degree of polymerization 2700 and the PVA film with a thickness of 30 micrometers were extended|stretched and conveyed, dyeing|staining between rolls with different circumferential speed ratios. First, it is immersed in a water bath at 30° C. for 1 minute to swell the PVA film, stretched to 1.2 times in the conveying direction, and then placed in an aqueous solution of potassium iodide (0.03% by weight) and iodine (0.3% by weight) (liquid temperature: 30°C) for 1 minute It extended|stretched 3 times (based on the unstretched film) in the conveyance direction, dyeing by immersion. Next, this stretched film was stretched 6 times (based on the unstretched film) in the transport direction while immersed in an aqueous solution (bath solution) of boric acid (4% by weight) and potassium iodide (5% by weight) for 30 seconds. After extending|stretching, it dried in 40 degreeC oven for 3 minutes, and obtained the 12.0 micrometers polarizing film.

(Creation of a polarizing film laminated body)

As an adhesive, a dope-curable adhesive, more specifically, a polyvinyl alcohol resin containing an acetoacetyl group (average degree of polymerization 1200, saponification degree 98.5 mol%, acetoacetylation degree 5 mol%) and methylolmelamine in a weight ratio of 3:1 aqueous solution was used. Using this adhesive, a transparent protective film (manufactured by Nitto Denko Corporation) having a thickness of 20 µm made of a modified acrylic polymer having a lactone ring structure was bonded to one side of the polarizing film under a temperature condition of 30°C. Specifically, it applied so that the total thickness of a dope hardening-type adhesive agent might be set to 1.0 micrometer, and was joined using the roll machine. On the other hand, on the other side of the polarizing film, as a polarizing film protective film having light absorption ability, the polarizing film protective film used in Example 1, that is, a triacetyl cellulose film containing a light absorber, and a light absorber disposed on the viewing side are contained. The polarizing film protective film which consists of a hard-coat layer to do was bonded together using the same dope hardening-type hardening-type adhesive agent by the method similar to one side instead of an ultraviolet curable adhesive agent. Thereafter, by heating and drying at 70° C. for 5 minutes in an oven, a polarizing film and a polarizing film protective film having no light absorbing ability on one surface of the polarizing film and a polarizing film protective film having light absorbing capacity on the other surface of the polarizing film The polarizing film laminated body which has was obtained.

(Measurement of iodine concentration)

By using dichloromethane and methyl ethyl ketone as a solvent, the polarizing film was taken out from the polarizing film laminated body, and the iodine concentration of the polarizing film was measured.

(Measurement of transmittance)

Transmittance was measured in the same manner as in Example 1.

[Comparative Example 5]

At the time of preparation of the polarizing film laminate of Example 3, the said one surface shall set it as Example 3, and it is a polarizing film protective film which has light absorption ability on the said other surface, Comprising: Triacetyl cellulose containing a light absorber A polarizing film protective film composed of a film (manufactured by Konica Minolta, trade name "KC2UA", thickness 25 µm) and a hard coat layer (manufactured by Nitto Denko Corporation, thickness 9 µm) having no light absorbing ability disposed on the viewing side was prepared in Examples In the same manner as in 3, bonding was performed through a dope-curable adhesive so that the total thickness of the curable adhesive was 1.0 μm. Moreover, the moisture content of the polarizing film laminated body was changed. The hard-coat layer was formed with the following method. First, a hard coat layer forming material is prepared. This is a resin solution in which an ultraviolet curable resin monomer or oligomer containing urethane acrylate as a main component is dissolved in butyl acetate (manufactured by DIC Corporation, trade name "Unidic 17-806", solid content concentration 80% by weight), with a solid content of 100 in the solution. 5 parts by weight of a photoinitiator (manufactured by BASF Co., Ltd., product name "IRGACURE906") per part by weight, and 0.01 parts by weight of a leveling agent (manufactured by DIC Corporation, product name "GRANDICpC4100") were added, and the solid content concentration in the solution was 36 It is prepared by adding cyclopentanone (hereinafter, referred to as “CPN”) and propylene glycol monomethyl ether (hereinafter, referred to as “PGM”) to the blending solution in a ratio of 45:55 so as to be % by weight. Thus, the produced hard-coat layer forming material was coated on the transparent protective film so that the thickness of the hard coat after hardening might be set to 9 micrometers, and the coating film was formed. Then, it dried at 90 degreeC for 1 minute, and after that, the ultraviolet-ray of 300 mJ/cm<2> of accumulated light quantity was irradiated with the high-pressure mercury-vapor lamp, and the said coating film was hardened.

Other than that, it is the same as that of Example 3.

[Example 4]

(Creation of polarizing film)

The average degree of polymerization of 2700 and the 45-micrometer-thick PVA film were extended|stretched and conveyed, dyeing|staining between rolls with different circumferential speed ratios. First, it is immersed in a water bath at 30° C. for 1 minute to swell the PVA film, stretched to 1.2 times in the conveying direction, and then placed in an aqueous solution of potassium iodide (0.03% by weight) and iodine (0.3% by weight) (liquid temperature: 30°C) for 1 minute It extended|stretched 3 times (based on an unstretched film) in the conveyance direction, dyeing by immersion. Next, the stretched film was immersed in an aqueous solution (bath solution) of boric acid (4% by weight), potassium iodide (5% by weight) and zinc sulfate (3.5% by weight) for 30 seconds in the conveying direction 6 times (based on unstretched film) ) was extended to After extending|stretching, it dried in 40 degreeC oven for 3 minutes, and obtained the 18.0 micrometers polarizing film.

(Creation of a polarizing film laminated body)

A transparent protective film (manufactured by Nitto Denko) having a thickness of 30 µm made of a modified acrylic polymer having a lactone ring structure on one side of the polarizing film was bonded to one side of the polarizing film through a dope-curable adhesive in the same manner as in Example 3. In addition, the other surface of the polarizing film was set as the structure similar to the said other surface of Example 3.

Other than that, it is the same as that of Example 3.

[Example 5]

At the time of preparation of the polarizing film laminate of Example 4, the said one side sets it as the structure similar to Example 4, It is a polarizing film protective film which has light absorption ability on the said other surface, Comprising: Triacetyl cellulose containing a light absorber Film (manufactured by Fujifilm, trade name "TJ40ULF", thickness 40 µm), a triacetyl cellulose film (manufactured by Konica Minolta, trade name "KC4UY", thickness 40 µm) containing a light absorber disposed on the visual side side, on the visual side A polarizing film protective film composed of a hard coat layer (manufactured by Nitto Denko Corporation, thickness 9 μm) having no light absorbing ability is bonded through a dope curing adhesive in the same manner as in Example 3 so that the total thickness of the curable adhesive is 1.0 μm. made it A triacetyl cellulose film (manufactured by Fujifilm, trade name "TJ40ULF", thickness 40 µm) and a triacetyl cellulose film (manufactured by Konica Minolta, trade name "KC4UY", thickness 40 µm) were prepared in the same manner as in Example 1. It was bonded through an ultraviolet curable adhesive so that the thickness was 1.0 μm.

(Measurement of iodine concentration)

By using dichloromethane and methyl ethyl ketone as a solvent, the polarizing film was taken out from the polarizing film laminated body, and the iodine concentration of the polarizing film was measured.

(Measurement of transmittance)

From the polarizing film laminate, the polarizing film protective film located on the viewing side rather than the polarizing film, that is, a polarizing film protective film comprising a triacetyl cellulose film, another triacetyl cellulose film, and a hard coat layer is removed, and the polarizing film protective film was measured for transmittance.

[Comparative Example 6]

In the preparation of the polarizing film laminate of Example 4, a 30 µm-thick transparent protective film (manufactured by Nitto Denko Corporation) made of a modified acrylic polymer having a lactone ring structure on one side of the polarizing film was prepared in the same manner as in Example 3. It was bonded through a dope-curable adhesive. On the other hand, as a polarizing film protective film having light absorption ability on the other side of the polarizing film, a triacetyl cellulose film (manufactured by Fujifilm, trade name "TJ40ULF", thickness 40 µm) containing a light absorber is a hard coat layer that does not have light absorption ability. The formed polarizing film protective film (manufactured by Nitto Denko Co., Ltd., thickness of 9 µm) was bonded through a dope-curable adhesive in the same manner as in Example 3 so that the total thickness of the curable adhesive was 1.0 µm. Moreover, the moisture content of the polarizing film laminated body was changed.

Other than that, it is the same as that of Example 4.

[Comparative Example 7]

At the time of creation of the polarizing film laminated body of the comparative example 6, in the dyeing|staining process, the density|concentration and immersion time of the iodine aqueous solution were adjusted, and the iodine density|concentration was changed. Moreover, the moisture content of the polarizing film laminated body was changed.

Other than that, it is the same as that of Comparative Example 6.

[Comparative Example 8]

At the time of creation of the polarizing film laminated body of Example 4, in the dyeing|staining process, the density|concentration and immersion time of the iodine aqueous solution were adjusted, and the iodine density|concentration was changed. Moreover, the moisture content of the polarizing film laminated body was changed.

Other than that, it is the same as that of Example 4.

[Example 6]

At the time of creation of the polarizing film laminated body of Example 4, in the dyeing|staining process, the density|concentration and immersion time of the iodine aqueous solution were adjusted, and the iodine density|concentration was changed. Moreover, the moisture content of the polarizing film laminated body was changed.

Other than that, it is the same as that of Example 4.

[Example 7]

(Creation of polarizing film)

At the time of creation of the polarizing film of Example 3, an extending|stretching process WHEREIN: The 75-micrometer-thick PVA film was stretched and conveyed, and the 28-micrometer polarizing film was obtained. In addition, in the dyeing process, the iodine concentration was changed by adjusting the density|concentration and immersion time of the iodine aqueous solution.

(Creation of a polarizing film laminated body)

It has the same structure as the said one surface and the said other surface of the polarizing film of Example 4, respectively on the other surface of one surface of a polarizing film. Moreover, the moisture content of the polarizing film laminated body was changed.

Other than that, it is the same as that of Example 4.

[Example 8]

At the time of creation of the polarizing film laminated body of Example 7, the water content of a polarizing film laminated body was changed. Moreover, in Example 7, it was immersed in the aqueous solution (bath solution) of zinc sulfate (3.5 weight%) when extending|stretching 6 times (based on an unstretched film) in a conveyance direction similarly to Example 4.

Other conditions were the same as in Example 7.

[Comparative Example 9]

(Creation of polarizing film)

The polarizing film of Example 7 was used.

(Creation of a polarizing film laminated body)

It has the same structure as the said one surface of the polarizing film of Examples 4-8 and the comparative example 8 on one surface of a polarizing film. On the other hand, on the other side of the polarizing film, as a polarizing film protective film having the same configuration as the other surface of the polarizing film of Comparative Example 5, that is, having a light absorption capacity, a triacetyl cellulose film containing a light absorber, and disposed on the viewing side A polarizing film protective film comprising a hard coat layer having no light absorbing ability was bonded through a dope-curable adhesive in the same manner as in Example 3 so that the total thickness of the curable adhesive was 1.0 µm. Moreover, the moisture content of the polarizing film laminated body was changed.

Other conditions were the same as in Example 7.

[Example 9]

At the time of preparation of the polarizing film of Example 4, in the dyeing|staining process, the density|concentration and immersion time of the iodine aqueous solution were adjusted, and the iodine density|concentration was changed.

Other than that, it is the same as that of Example 4.

[Example 10]

At the time of preparation of the polarizing film of Example 3, the iodine concentration was changed by adjusting the density|concentration and immersion time of the iodine aqueous solution in a dyeing process.

In addition, when creating the polarizing film laminate of Example 3, one side of the polarizing film is bonded to a transparent protective film made of a modified acrylic polymer having a lactone ring structure, and instead of a transparent protective film having a thickness of 20 µm, a thickness of 30 µm of transparent protective film (manufactured by Nitto Denko) was used. Moreover, the moisture content of the polarizing film laminated body was changed.

Other than that, it is the same as that of Example 3.

[Comparative Example 10]

At the time of preparation of the polarizing film of Example 9, the iodine concentration was changed by adjusting the density|concentration and immersion time of the iodine aqueous solution in a dyeing process.

In the preparation of the polarizing film laminate of Example 9, a transparent protective film (manufactured by Nitto Denko Corporation) having a thickness of 30 µm and made of a modified acrylic polymer having a lactone ring structure on one surface of the polarizing film (manufactured by Nitto Denko Corporation) was prepared in the same manner as in Example 3. It was bonded through a dope-curable adhesive. On the other hand, as a polarizing film protective film having light absorption ability on the other side of the polarizing film, a triacetyl cellulose film (manufactured by Fujifilm, trade name "TJ40ULF", thickness 40 µm) containing a light absorber is a hard coat layer that does not have light absorption ability. The formed polarizing film protective film (manufactured by Nitto Denko Co., Ltd., thickness of 9 µm) was bonded through a dope-curable adhesive in the same manner as in Example 3 so that the total thickness of the curable adhesive was 1.0 µm. Moreover, the moisture content of the polarizing film laminated body was changed.

Other than that, it is the same as Example 9.

[Example 11]

At the time of preparation of the polarizing film of Example 3, the iodine concentration was changed by adjusting the density|concentration and immersion time of the iodine aqueous solution in a dyeing process.

In addition, in the preparation of the polarizing film laminate of Example 3, as an adhesive, a dope curing type curable adhesive, more specifically, a polyvinyl alcohol resin containing an acetoacetyl group (average degree of polymerization 1200, degree of saponification 98.5 mol%, degree of acetoacetylation 5 %) and an aqueous solution containing methylolmelamine in a weight ratio of 3:1 was used. Using this adhesive, a 25-micrometer-thick transparent protective film made of triacetyl cellulose was bonded to one surface of the polarizing film. Specifically, it applied so that the total thickness of a dope hardening-type adhesive agent might be set to 1.0 micrometer, and was joined using the roll machine. On the other hand, on the other side of the polarizing film, as a polarizing film protective film having light absorption ability, the polarizing film protective film used in Example 1, that is, a triacetyl cellulose film containing a light absorber, and a light absorber disposed on the viewing side are contained. The polarizing film protective film which consists of a hard-coat layer to do was bonded together using the same dope hardening-type hardening-type adhesive agent by the method similar to one side instead of an ultraviolet curable adhesive agent. Thereafter, by heating and drying at 70° C. for 5 minutes in an oven, a polarizing film and a polarizing film protective film having no light absorbing ability on one surface of the polarizing film and a polarizing film protective film having light absorbing capacity on the other surface of the polarizing film The polarizing film laminated body which has was obtained.

[Comparative Example 11]

At the time of preparation of the polarizing film laminate of Example 11, as an adhesive agent, a dope hardening type hardening adhesive, more specifically, polyvinyl alcohol resin containing an acetoacetyl group (average degree of polymerization 1200, degree of saponification 98.5 mol%, degree of acetoacetylation 5 mol %) and an aqueous solution containing methylolmelamine in a weight ratio of 3:1 was used. Using this adhesive, a 25-micrometer-thick transparent protective film made of triacetyl cellulose was bonded to one surface of the polarizing film. Specifically, it applied so that the total thickness of a dope hardening-type adhesive agent might be set to 1.0 micrometer, and was joined using the roll machine. On the other hand, on the other side of the polarizing film, as a polarizing film protective film having light absorption ability, the polarizing film protective film used in Comparative Example 5, that is, a triacetyl cellulose film containing a light absorber, and a light absorber disposed on the viewing side. The polarizing film protective film which consists of a hard-coat layer which is not made was bonded together using the same dope hardening-type hardening-type adhesive agent by the method similar to one side instead of an ultraviolet curable adhesive agent.

[Comparative Example 12]

At the time of preparation of the polarizing film of Example 11, the iodine concentration was changed by adjusting the density|concentration and immersion time of the iodine aqueous solution in the dyeing|staining process.

Other than that, it is the same as Example 11.

[Comparative Example 13]

At the time of preparation of the polarizing film of Comparative Example 11, in the dyeing|staining process, the density|concentration and immersion time of the iodine aqueous solution were adjusted, and the iodine density|concentration was changed.

Other than that, it is the same as that of Comparative Example 11.

4-1. reliability test

Using the polarizing film laminated body 12 obtained by the Example and the comparative example, as shown in FIG. 5, the glass plate (made by Matsunami Glass) on each of both surfaces of the polarizing film laminated body 12 through the transparent adhesives 11 and 13. Slide glass, part number: S2000423, specifications: water polishing 65x165mm, thickness 1.3mm) laminated|stacked was used as a sample.

As the pressure-sensitive adhesive, CS98210US (manufactured by Nitto Denko) having a thickness of 200 µm is used on one side of the polarizing film laminate, and on the other side of the polarizing film laminate, CRT1794YCU is an acrylic type used in a polarizing film laminate (manufactured by Nitto Denko). An adhesive (thickness of 20 µm) was used. The acrylic pressure-sensitive adhesive used on the other side is 99 parts by weight of butyl acrylate (the same hereinafter), 1.0 parts of 4-hydroxybutyl acrylate, and 2,2'- After adding 0.3 parts of azobisisobutylonitrile together with ethyl acetate and reacting at 60° under a nitrogen gas stream for 4 hours, ethyl acetate is added to the reaction solution and a solution containing an acrylic polymer with a weight average molecular weight of 1.65 million (solid content) concentration of 30% by weight), 0.3 parts of dibenzoyl peroxide (Nippon Yushi Co., Ltd.: Nyper BMT) per 100 parts of the solid content of this acrylic polymer solution, and 0.1 parts of trimethylol propane xylene diisocyanate (Mitsui Takeda Chemical Co., Ltd.) )): Takenate D110N) and 0.2 parts of a silane coupling agent (Rokken Chemical Co., Ltd.: A-100, acetoacetyl group-containing silane coupling agent) were blended.

A xenon light irradiation test was performed on each sample using a xenon weather meter (manufactured by Suga Shikenki Co., Ltd.: NX75).

(Xenon light irradiation test)

The sample is irradiated with xenon light at an irradiance of 100 W/m 2 that is integrated in a wavelength range of 300 to 400 nm for 200 hours under an atmosphere of a black panel temperature of 89° C. and 30% R.H. As the light source, a xenon lamp (manufactured by Suga Chemical Co., Ltd.) with a daylight filter (manufactured by Suga Electric Corporation) attached to it was used. Color loss and heat redness were evaluated after 200 hours of irradiation, and polyenization was similarly evaluated after 200 hours of irradiation.

4-2. Evaluation standard

The evaluation criteria of polyenization, heat redness, and color loss are shown below.

<Polyenization>

The single transmittance of the sample was measured before and after the xenon light irradiation test, and the amount of change ΔTs of the single transmittance was calculated by the following formula.

(Formula)ΔTs=Tsxenon 200-Ts ₀

Here, Ts ₀ is the single transmittance of the sample before xenon irradiation, and Ts xenon 200 is the single transmittance after the xenon light irradiation test. When the single transmittance after irradiating with xenon light for 200 hours was -0.5 or more compared to the single transmittance before xenon light irradiation, the polyenization problem was evaluated as an acceptable range and no problem. When the single transmittance after irradiating with xenon light for 200 hours was -0.2 or more compared with the single transmittance before irradiation with xenon light, it was evaluated that there was no problem with polyenization. Moreover, when the single transmittance|permeability after irradiating with xenon light for 200 hours was the same as or larger than the single transmittance|permeability before xenon light irradiation, it was evaluated that the problem of polyenization is no more problematic.

The single transmittance was measured for the sample using a spectrophotometer (product name "DOT-3" manufactured by Murakami Shikisai Kijutsu Kenkyusho Co., Ltd.). In addition, the single transmittance|permeability can be calculated|required according to JISZ8701.

<Color loss/heating redness>

Before and after the xenon light irradiation test, the sample was placed on a cross nicol, and the orthogonal transmittance (%) at a wavelength of 410 nm and a wavelength of 700 nm was measured with the above spectrophotometer, respectively, and the amount of change ΔHs ₄₁₀ and ΔHs ₇₀₀ , respectively, was determined.

What satisfies both of the following two conditions was evaluated as "color loss" of the sample.

Change amount ΔHs ₄₁₀ is 1% or more

・Amount of change ΔHs ₇₀₀ is 5% or more

In other words, when the amount of change in the orthogonal transmittance at a wavelength of 410 nm is less than 1% after irradiating with xenon light for 200 hours, and the amount of change in the orthogonal transmittance at a wavelength of 700 nm is less than 5%, it was evaluated that there is no problem of color loss. .

Moreover, what satisfied the following conditions was evaluated as "heat redness" of the sample.

Change amount ΔHs ₄₁₀ is less than 1%

・Amount of change ΔHs ₇₀₀ is 5% or more

In other words, when the amount of change in the orthogonal transmittance at a wavelength of 410 nm after irradiating with xenon light for 200 hours is 1% or more and the change in the orthogonal transmittance at a wavelength of 700 nm is less than 5%, it was evaluated that there is no problem of heat redness. .

The evaluation results in each Example and Comparative Example are shown in Tables 2 and 3 below.

5. Summary of evaluation results

6 shows the results of Examples and Comparative Examples in which the results of Examples and Comparative Examples are plotted in the x-y Cartesian coordinate system. Conversely, Fig. 7 similarly shows the results of "Comparative Example" in which the results of Examples and Comparative Examples are plotted around Comparative Examples, more specifically, when the results of Examples and Comparative Examples overlap. The x-axis (horizontal axis) represents the iodine concentration (wt.%) of the polarizing film, and the y-axis (vertical axis) represents the moisture content (g/m 2 ) of the polarizing film laminate.

(1) From the results of the plot and common technical knowledge, in general, when the iodine concentration is small and the moisture content is too small, the problem of heating redness occurring at a high temperature is easy to occur. On the other hand, when the iodine concentration is large and the moisture content is too large, It can be said that polyenization and color loss are easy to occur. In addition, when the iodine concentration is small and the moisture content is too large, the problem of color loss occurring in a high temperature and high humidity state is likely to occur. In particular, between discoloration and polyenization, a transition region between them (Comparative Example 1) was also observed. In addition, although the result of heating redness is not specifically shown in FIG. 6, it can be said that it is clear from technical common knowledge that this phenomenon arises when an iodine concentration is small and a water content is too small.

On the other hand, when both the iodine concentration and the moisture content are in a state in which the balance is achieved neither too large nor too small, and accordingly, when the iodine concentration and the moisture content are accommodated in a predetermined area capable of achieving such a balance, heating reddens , polyenization, and color loss can be comprehensively solved. For example, all of the results of Examples have small fractions but large iodine concentrations around the plot showing the results of Example 2, that is, iodine concentration 6.0 wt. ) and the periphery of the plot showing the result of Example 7 in which the iodine concentration is (the most) but the moisture content is large, that is, the iodine concentration of 1.8 wt.% and the moisture content of 4.2 g/m2 (hereinafter, the second coordinate point) Above the dividing line "α", that is, y = (239.4-35x)/42, the periphery of the plot showing the result of Example 6 with the (most) large water content but the (most) small iodine concentration, that is, the iodine concentration 1.8 The periphery of the plot showing the results of Example 1 in which the wt.% and water content is 5.1 g/m2 (hereinafter, the third coordinate point), and the iodine concentration is (the largest) but the water content is (the smallest), that is, the iodine concentration It is positioned below the dividing line "β" passing through the coordinate point (hereinafter, the fifth coordinate point) of 7.0 wt.% and the moisture content of 0.7 g/m 2 , that is, y=(344.4-44x)/52. Accordingly, at least the region demarcated by these dividing lines “α” and “β” can be grasped as a line representing the requirements necessary for comprehensively solving all of heat redness, polyenization, and color loss. In addition, considering the results of Comparative Examples, coordinate points that can be connected to each of the third coordinate point and the fifth coordinate point without including the comparative example, that is, a coordinate point having an iodine concentration of 5.7 wt.% and a water content of 2.6 g/m2 (hereinafter, the fourth coordinate point) may be considered. That is, the results of the examples are all below the dividing line “γ1” passing through the third coordinate point and the fourth coordinate point, that is, y = (243.9-25x)/39, and passing through the fourth coordinate point and the fifth coordinate point. It is positioned below the dividing line "γ2", that is, y=(142.1-19x)/13. In addition, these dividing lines "α", "β", "γ1", and "γ2" are applied to all polarizing films having a film thickness of about 4 to 30 µm, more specifically, regardless of the film thickness of the polarizing film. has been

(2) In these respects, in particular, for all polarizing films having a film thickness of about 4 to 30 µm, the iodine concentration and the moisture content of the polarizing film laminate are, for example, a region surrounded by a to e; Specifically, the first coordinate point (“a” in the drawing) having an iodine concentration of 6.0 wt.% and a water content of 0.7 g/m2, and a second coordinate point having an iodine concentration of 1.8 wt.% and a water content of 4.2 g/m2 (“ b"), the second line segment connecting the second coordinate point "b", and the third coordinate point ("c" in the drawing) having an iodine concentration of 1.8 wt.% and a water content of 5.1 g/m2; The third line segment connecting the third coordinate point “c” and the fourth coordinate point (“d” in the drawing) having an iodine concentration of 5.7 wt.% and a water content of 2.6 g/m2, the fourth coordinate point “d”, and iodine A fourth line segment connecting the fifth coordinate point (“e” in the drawing) with a concentration of 7.0 wt.% and a moisture content of 0.7 g/m2, and a fourth line connecting the first coordinate point “a” and the fifth coordinate point “e” It can be seen that all of "polyenization", "color loss", and "heat redness" can be comprehensively solved when included in the area surrounded by the 5 line segments.

(3) Similarly, in particular, for a polarizing film having a film thickness of about 11 to 30 µm, the iodine concentration and the moisture content of the polarizing film laminate are the regions surrounded by f, b, c, g, more specifically The 6th line segment connecting the 6th coordinate point (“ｆ” in the drawing) and the second coordinate point “b” with an iodine concentration of 4.5 wt.% and a water content of 1.9 g/m 2 , the second coordinate point “b” and the third coordinate The second line segment connecting the point "c", the third line segment connecting the third coordinate point "c" and the seventh coordinate point ("g" in the drawing) with an iodine concentration of 4.5 wt.% and a water content of 3.4 g/m2; and “polyenization”, “color loss”, and “heat redness” when included in the area surrounded by the eighth line segment connecting the sixth coordinate point “f” and the seventh coordinate point “g” comprehensively know what can be solved.

In particular, the 6th coordinate point "f" is the 8th coordinate point ("f-1" in the drawing) with an iodine concentration of 4.0 wt.% and a water content of 2.4 g/m2, and the 7th coordinate point "g" is an iodine concentration of 4.0 wt. In the case of the ninth coordinate point (“g-1” in the drawing) of . In addition, the 6th coordinate point "f" is the 10th coordinate point ("h" in the drawing) with an iodine concentration of 3.7 wt.% and a water content of 2.6 g/m2, and the 7th coordinate point "g" is the fourth coordinate point "d" Even in the case of , it is considered that a desirable result is obtained.

(4) In particular, for a polarizing film having a film thickness of about 4 to 11 μm, the iodine concentration and the moisture content of the polarizing film laminate are the regions surrounded by a, h, d, and e, more specifically, the second The ninth line segment connecting the first coordinate point "a" and the tenth coordinate point "h", the eleventh line segment connecting the tenth coordinate point "h" and the fourth coordinate point "d", and the first coordinate point "a" It can be seen that "polyenization", "color loss", and "heat redness" can all be comprehensively solved when included in the area surrounded by the fifth line segment connecting " ' and the fifth coordinate point "e". .

Further, as is apparent from the comparison between Figs. 6 and 7, it can be seen that polyenization is particularly effectively prevented by forming the light absorbing layer having light absorbing ability.

In addition, in the above example, an example in which a light absorber was added to the polarizing film protective film was shown. However, the same result is obtained even when the above-mentioned reliability test is performed by containing a light absorber (ultraviolet absorber) in the transparent adhesive (OCA) 13 (transparent adhesive layer). Further, the same result is obtained even when the above-described reliability test is performed by containing a light absorbent (ultraviolet absorber) in the cover plate 14 (transparent cover plate). In that case, the reliability test using the cover plate 14 instead of the glass plate (slide glass made by Matsunami Glass, part number: S2000423, specifications: water polishing 65 x 165 mm, thickness 1.3 mm) is used on the viewing side rather than the transparent adhesive 13 do

1: Optical display panel
10: optical display cell
11: clear adhesive
12: polarizing film laminate
13: transparent adhesive
14: transparent cover plate
120: polarizing film
121: polarizing film protective film having light absorption ability
122: polarizing film protective film

Claims (21)

A polarizing film laminate comprising: a polarizing film made of a polyvinyl alcohol-based resin; and an optically transparent polarizing film protective film bonded to at least a viewing-side surface of the polarizing film directly or via another optical film,
In an xy orthogonal coordinate system in which the iodine concentration (wt.%) of the polarizing film is taken on the x-axis and the moisture content (g/m 2 ) of the polarizing film laminate is taken on the y-axis, respectively,
A first line segment connecting the first coordinate point having an iodine concentration of 6.0 wt.% and a moisture content of 0.7 g/m2 and a second coordinate point having an iodine concentration of 1.8 wt.% and a moisture content of 4.2 g/m2;
a second line segment connecting the second coordinate point and the third coordinate point having an iodine concentration of 1.8 wt.% and a moisture content of 5.1 g/m2;
A third line segment connecting the third coordinate point and the fourth coordinate point having an iodine concentration of 5.7 wt.% and a moisture content of 2.6 g/m2;
a fourth line segment connecting the fourth coordinate point and the fifth coordinate point having an iodine concentration of 7.0 wt.% and a moisture content of 0.7 g/m 2 , and
A fifth line segment connecting the first coordinate point and the fifth coordinate point
has an iodine concentration and moisture content included in the area surrounded by
The polarizing film protective film is a light absorption layer having a light absorption ability, and a polarizing film laminate, characterized in that the transmittance of light at a wavelength of 380 nm is 5% or less. The method of claim 1,
The polarizing film laminated body whose film thickness of the said polarizing film is 4-30 micrometers. A polarizing film laminate comprising: a polarizing film made of a polyvinyl alcohol-based resin; and an optically transparent polarizing film protective film bonded to at least a viewing-side surface of the polarizing film directly or via another optical film,
In an xy orthogonal coordinate system in which the iodine concentration (wt.%) of the polarizing film is taken on the x-axis and the moisture content (g/m 2 ) of the polarizing film laminate is taken on the y-axis, respectively,
A sixth line segment connecting a sixth coordinate point having an iodine concentration of 4.5 wt.% and a water content of 1.9 g/m2 and a second coordinate point having an iodine concentration of 1.8 wt.% and a water content of 4.2 g/m2;
a second line segment connecting the second coordinate point and the third coordinate point having an iodine concentration of 1.8 wt.% and a moisture content of 5.1 g/m2;
A seventh line segment connecting the third coordinate point and the seventh coordinate point having an iodine concentration of 4.5 wt.% and a water content of 3.4 g/m 2 , and
an eighth line segment connecting the sixth coordinate point and the seventh coordinate point
has an iodine concentration and moisture content included in the area surrounded by
The polarizing film protective film is a light absorption layer having a light absorption ability, and a polarizing film laminate, characterized in that the transmittance of light at a wavelength of 380 nm is 5% or less. 4. The method of claim 3,
The sixth coordinate point is an eighth coordinate point with an iodine concentration of 4.0 wt.% and a water content of 2.4 g/m2, and the seventh coordinate point is a ninth coordinate point with an iodine concentration of 4.0 wt.% and a water content of 3.7 g/m2. sifter. 4. The method of claim 3,
The sixth coordinate point is a tenth coordinate point having an iodine concentration of 3.7 wt.% and a water content of 2.6 g/m 2 , and the seventh coordinate point is the fourth coordinate point. 5. The method according to claim 3 or 4,
The polarizing film laminated body whose film thickness of the said polarizing film is 11-30 micrometers. A polarizing film laminate comprising: a polarizing film made of a polyvinyl alcohol-based resin; and an optically transparent polarizing film protective film bonded to at least a viewing-side surface of the polarizing film directly or via another optical film,
In an xy orthogonal coordinate system in which the iodine concentration (wt.%) of the polarizing film is taken on the x-axis and the moisture content (g/m 2 ) of the polarizing film laminate is taken on the y-axis, respectively,
A ninth line segment connecting the first coordinate point having an iodine concentration of 6.0 wt.% and a moisture content of 0.7 g/m2 and a tenth coordinate point having an iodine concentration of 3.7 wt.% and a moisture content of 2.6 g/m2;
A tenth line segment connecting the tenth coordinate point and the fourth coordinate point having an iodine concentration of 5.7 wt.% and a water content of 2.6 g/m2;
an eleventh line segment connecting the fourth coordinate point and the fifth coordinate point having an iodine concentration of 7.0 wt.% and a moisture content of 0.7 g/m2;
and
A fifth line segment connecting the first coordinate point and the fifth coordinate point
has an iodine concentration and moisture content included in the area surrounded by
The polarizing film protective film is a light absorption layer having a light absorption ability, and a polarizing film laminate, characterized in that the transmittance of light at a wavelength of 380 nm is 5% or less. 8. The method of claim 7,
The polarizing film laminated body whose film thickness of the said polarizing film is 4-11 micrometers. 9. The method according to any one of claims 1 to 8,
The polarizing film protective film has a light transmittance of 35% or less at a wavelength of 390 nm, a polarizing film laminate. 10. The method according to any one of claims 1 to 9,
The polarizing film protective film has a light transmittance of 70% or less at a wavelength of 400 nm, a polarizing film laminate. 11. The method according to any one of claims 1 to 10,
The polarizing film laminated body in which the said polarizing film contains zinc. 12. The method according to any one of claims 1 to 11,
A sample comprising the polarizing film laminate according to any one of claims 1 to 11 and a glass plate laminated on both surfaces of the polarizing film laminate through an adhesive was subjected to xenon at a black panel temperature of 89° C. and 30% RH in an atmosphere. The single transmittance after irradiating with the irradiance 100W/m<2> which integrated light in the wavelength range of 300-400 nm for 200 hours is -0.5 or more compared with the single transmittance before irradiation, The polarizing film laminated body. 13. The method according to any one of claims 1 to 12,
The black panel temperature of 89 degreeC, 30%RH in the sample which consists of the polarizing film laminated body in any one of Claims 1-12, and the glass plate laminated|stacked on both surfaces of the said polarizing film laminated body via an adhesive After irradiating xenon light with an irradiance of 100 W/m2 integrated in a wavelength range of 300 to 400 nm for 200 hours in an atmosphere, the amount of change in orthogonal transmittance at a wavelength of 410 nm is less than 1%, and the amount of change in orthogonal transmittance at a wavelength of 700 nm is 5 % of the polarizing film laminate. 14. The method according to any one of claims 1 to 13,
The black panel temperature of 89 degreeC in the sample which consists of the polarizing film laminated body in any one of Claims 1-13, and the glass plate laminated|stacked through the adhesive on both surfaces of the said polarizing film laminated body, 30%RH After irradiating xenon light with an irradiance of 100 W/m2 integrated in a wavelength range of 300 to 400 nm in an atmosphere for 200 hours, the amount of change in the orthogonal transmittance at a wavelength of 410 nm is 1% or more, and the amount of change in the orthogonal transmittance at a wavelength of 700 nm is 5 % of the polarizing film laminate. an optical display cell;
The polarizing film layered product according to any one of claims 1 to 14, directly or via another optical film, bonded to one surface of the optical display cell;
and an optically transparent cover plate disposed along the polarizing film laminate on the opposite side to the optical display cell,
The optical display panel, characterized in that the optical display cell, the polarizing film laminate, and the transparent cover plate are adhered to each other by a transparent adhesive layer that fills a gap therebetween. 16. The method of claim 15,
An optical display panel wherein the transparent cover plate has a function of a capacitive touch sensor. 17. The method of claim 16,
An ITO layer, which is a component of a capacitive touch sensor, is formed between the transparent cover plate and the polarizing film laminate, an optical display panel. A polarizing film laminate comprising: a polarizing film made of a polyvinyl alcohol-based resin;
and a transparent adhesive layer laminated on the visual side of the polarizing film laminate,
In an xy orthogonal coordinate system in which the iodine concentration (wt.%) of the polarizing film is taken on the x-axis and the moisture content (g/m 2 ) of the polarizing film laminate is taken on the y-axis, respectively,
A first line segment connecting the first coordinate point having an iodine concentration of 6.0 wt.% and a moisture content of 0.7 g/m2 and a second coordinate point having an iodine concentration of 1.8 wt.% and a moisture content of 4.2 g/m2;
a second line segment connecting the second coordinate point and the third coordinate point having an iodine concentration of 1.8 wt.% and a moisture content of 5.1 g/m2;
A third line segment connecting the third coordinate point and the fourth coordinate point having an iodine concentration of 5.7 wt.% and a moisture content of 2.6 g/m2;
a fourth line segment connecting the fourth coordinate point and the fifth coordinate point having an iodine concentration of 7.0 wt.% and a moisture content of 0.7 g/m 2 , and
A fifth line segment connecting the first coordinate point and the fifth coordinate point
has an iodine concentration and moisture content included in the area surrounded by
Among the transparent adhesive layer and the polarizing film protective film, at least the transparent adhesive layer is a light absorbing layer having light absorption ability,
A polarizing film laminate with a transparent adhesive layer, wherein the transparent adhesive layer and the polarizing film protective film have a light transmittance of 5% or less at a wavelength of 380 nm. A polarizing film laminate comprising: a polarizing film made of polyvinyl alcohol-based resin;
and a transparent adhesive layer laminated on the visual side of the polarizing film laminate,
In an xy orthogonal coordinate system in which the iodine concentration (wt.%) of the polarizing film is taken on the x-axis and the moisture content (g/m 2 ) of the polarizing film laminate is taken on the y-axis, respectively,
A first line segment connecting the first coordinate point having an iodine concentration of 6.0 wt.% and a moisture content of 0.7 g/m2 and a second coordinate point having an iodine concentration of 1.8 wt.% and a moisture content of 4.2 g/m2;
a second line segment connecting the second coordinate point and the third coordinate point having an iodine concentration of 1.8 wt.% and a moisture content of 5.1 g/m2;
A third line segment connecting the third coordinate point and the fourth coordinate point having an iodine concentration of 5.7 wt.% and a moisture content of 2.6 g/m2;
a fourth line segment connecting the fourth coordinate point and the fifth coordinate point having an iodine concentration of 7.0 wt.% and a moisture content of 0.7 g/m 2 , and
has an iodine concentration and moisture content contained in an area surrounded by a fifth line segment connecting the first coordinate point and the fifth coordinate point,
The transparent adhesive layer is a light absorption layer having a light absorption ability,
A polarizing film laminate with a transparent adhesive layer, wherein the transparent adhesive layer has a light transmittance of 5% or less at a wavelength of 380 nm. A polarizing film laminate comprising: a polarizing film made of a polyvinyl alcohol-based resin;
A transparent adhesive layer laminated on the viewer side than the polarizing film laminate;
and an optically transparent cover plate laminated on the viewing side rather than the transparent adhesive layer,
In an xy orthogonal coordinate system in which the iodine concentration (wt.%) of the polarizing film is taken on the x-axis and the moisture content (g/m 2 ) of the polarizing film laminate is taken on the y-axis, respectively,
A first line segment connecting the first coordinate point having an iodine concentration of 6.0 wt.% and a moisture content of 0.7 g/m2 and a second coordinate point having an iodine concentration of 1.8 wt.% and a moisture content of 4.2 g/m2;
a second line segment connecting the second coordinate point and the third coordinate point having an iodine concentration of 1.8 wt.% and a moisture content of 5.1 g/m2;
A third line segment connecting the third coordinate point and the fourth coordinate point having an iodine concentration of 5.7 wt.% and a moisture content of 2.6 g/m2;
a fourth line segment connecting the fourth coordinate point and the fifth coordinate point having an iodine concentration of 7.0 wt.% and a moisture content of 0.7 g/m 2 , and
A fifth line segment connecting the first coordinate point and the fifth coordinate point
has an iodine concentration and moisture content included in the area surrounded by
Among the polarizing film protective film, the transparent adhesive layer, and the transparent cover plate, at least the transparent cover plate is a light absorption layer having a light absorption ability,
The polarizing film assembly, characterized in that the transmittance of light at a wavelength of 380 nm of the laminate of the polarizing film protective film, the transparent adhesive layer, and the transparent cover plate is 5% or less. A polarizing film laminate comprising: a polarizing film made of polyvinyl alcohol-based resin;
A transparent adhesive layer laminated on the viewer side than the polarizing film laminate;
and an optically transparent cover plate laminated on the viewing side rather than the transparent adhesive layer,
In an xy orthogonal coordinate system in which the iodine concentration (wt.%) of the polarizing film is taken on the x-axis and the moisture content (g/m 2 ) of the polarizing film laminate is taken on the y-axis, respectively,
A first line segment connecting the first coordinate point having an iodine concentration of 6.0 wt.% and a moisture content of 0.7 g/m2 and a second coordinate point having an iodine concentration of 1.8 wt.% and a moisture content of 4.2 g/m2;
a second line segment connecting the second coordinate point and the third coordinate point having an iodine concentration of 1.8 wt.% and a moisture content of 5.1 g/m2;
A third line segment connecting the third coordinate point and the fourth coordinate point having an iodine concentration of 5.7 wt.% and a moisture content of 2.6 g/m2;
a fourth line segment connecting the fourth coordinate point and the fifth coordinate point having an iodine concentration of 7.0 wt.% and a moisture content of 0.7 g/m 2 , and
has an iodine concentration and moisture content contained in an area surrounded by a fifth line segment connecting the first coordinate point and the fifth coordinate point,
Among the transparent adhesive layer and the transparent cover plate, at least the transparent cover plate is a light absorption layer having light absorption ability,
A polarizing film assembly, characterized in that the transmittance of light at a wavelength of 380 nm of the laminate of the transparent adhesive layer and the transparent cover plate is 5% or less.

Images