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Polarizing film laminate, optical display panel using same, polarizing film laminate with transparent adhesive layer, and polarizing film assembly

A laminated body and polarizing film technology, which is applied in the direction of optics, polarizing elements, optical elements, etc., can solve the problems of large variation and low reliability of polarizers, etc.

Pending Publication Date: 2022-04-08
NITTO DENKO CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In a high-temperature environment, etc., the inside of the polarizer will reach a high-temperature and high-humidity state. As a result, the amount of change in light transmittance, degree of polarization, and color of the image will increase, and the reliability of the polarizer will decrease. Therefore, it is proposed that Proposal to attach a protective film with low moisture permeability while keeping the moisture content of the polarizer as low as possible

Method used

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  • Polarizing film laminate, optical display panel using same, polarizing film laminate with transparent adhesive layer, and polarizing film assembly
  • Polarizing film laminate, optical display panel using same, polarizing film laminate with transparent adhesive layer, and polarizing film assembly
  • Polarizing film laminate, optical display panel using same, polarizing film laminate with transparent adhesive layer, and polarizing film assembly

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0235] (production of polarizing film)

[0236] As the resin substrate, a long amorphous isophthalic acid-copolyethylene terephthalate film (modification rate of isophthalic acid group: 5 mol%, thickness: 100 μm) was used (modification rate = Ethylene isophthalate unit / (ethylene terephthalate unit+ethylene isophthalate unit)). Corona treatment is performed on one side of the resin substrate (treatment conditions: 55W·min / m 2 ), at normal temperatures, the corona treatment surface is coated with PVA and an aqueous solution of potassium iodide that is 13 parts by weight relative to PVA. Acetyl-modified PVA (manufactured by Nippon Synthetic Chemical Industry Co., Ltd., trade name "GOHSEFIMER Z410") was blended in 10 parts by weight. Then, it dried at 60 degreeC, the PVA-type resin layer of thickness 13 micrometers was formed, and the laminated body was produced.

[0237] The obtained laminate was uniaxially stretched to 2.4 times in the longitudinal direction (longitudinal dir...

Embodiment 2

[0254] When producing the polarizing film of Example 1, in the dyeing process, the iodine concentration was changed by adjusting the concentration and immersion time of the iodine aqueous solution.

[0255] In addition, when producing the polarizing film laminate of Example 1, a cycloolefin film (ZEONOR FILM, 13 μm, manufactured by Nippon Zeon Co., Ltd.) was bonded to one side of the polarizing film as a polarizing film protective film with an ultraviolet curable adhesive. Since the cycloolefin-based film is provided on one side of the polarizing film, it does not affect the value of the light absorption capability. On the other hand, the other surface of the polarizing film was made into the same structure as the said other surface of Example 1. In addition, the water content of the polarizing film laminate was changed.

[0256] Others are the same as in Example 1.

Embodiment 3

[0271] (production of polarizing film)

[0272] A PVA film having an average degree of polymerization of 2700 and a thickness of 30 μm was stretched and conveyed between rolls having different peripheral speed ratios while being dyed. First, after immersing in a water bath at 30° C. for 1 minute to swell the PVA film, while stretching it 1.2 times in the conveying direction, in an aqueous solution of potassium iodide (0.03% by weight) and iodine (0.3% by weight) (liquid temperature 30° C. ) in 1 minute, stretching to 3 times in the transport direction while being dyed (unstretched film standard). Next, while immersing the stretched film in an aqueous solution (bath solution) of boric acid (4% by weight) and potassium iodide (5% by weight) for 30 seconds, it was stretched to 6 times in the conveyance direction (unstretched film benchmark). After stretching, drying was performed in an oven at 40° C. for 3 minutes to obtain a polarizing film of 12.0 μm.

[0273] (Production of...

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Abstract

The present invention provides a polarizing film laminate and the like capable of collectively solving the problems of polyalkylene, discoloration, and heating redness by suppressing the influence caused by sunlight irradiation. In an orthogonal coordinate system in which the x-axis is the iodine concentration (wt.%) of the polarizing film and the y-axis is the moisture content (g / m < 2 >) of the polarizing film laminate, the polarizing film laminate has an iodine concentration and a moisture content included in a region in which the x-y coordinate point is a first coordinate point of (6.0, 0.7) and a second coordinate point of (1.8, 4.2), and the x-y coordinate point is a second coordinate point of (1.8, 4.2). The polarizing film protection film is formed by enclosing a second line segment of a third coordinate point of (5.7, 2.6), a third line segment connecting the third coordinate point and a fourth coordinate point of (5.7, 2.6), a fourth line segment connecting the fourth coordinate point and a fifth coordinate point of (7.0, 0.7), and a fifth line segment connecting the first coordinate point and the fifth coordinate point, and the polarizing film protection film is a light absorption layer having light absorption ability. And the transmittance of light having a wavelength of 380 nm is 5% or less.

Description

technical field [0001] The present invention relates to a polarizing film laminate, an optical display panel using the polarizing film laminate, a polarizing film laminate with a transparent adhesive layer, and a polarizing film assembly. Background technique [0002] In recent years, in addition to the use of optical display panels such as liquid crystal panels and organic EL panels in electronic devices such as smartphones and personal computers, and electrified products such as IoT home appliances, they have also been found to be used in powered vehicles such as automobiles, trains, and airplanes. various possibilities. For example, it is conceivable to mount optical display panels on windshields, dashboards, exteriors, and various other vehicle body parts of automobiles to provide various information to the driver and to transmit various information to the outside. [0003] Accompanying such a situation, for example, durability in severe environments such as inside a po...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B5/30G02B1/14
CPCG02B5/30G02F1/1333G02F1/1335H05B33/02G02B5/3033G02F1/133528G06F3/044
Inventor 大塚大祐河村亮伊崎章典谷周一竹田哲郎高田胜则木村启介山下智弘杉野洋一郎
Owner NITTO DENKO CORP
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