Retardation film and polarizing plate with retardation layer

A technology of retardation film and retardation layer, which is applied in the field of polarizing plates and can solve problems such as insufficient folding resistance and whitening

Pending Publication Date: 2021-11-16
NITTO DENKO CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when the conventional retardation film is used in an image display device, whitening and / or cracks may occur during use, and furthermore, the folding resistance may not be sufficient.

Method used

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  • Retardation film and polarizing plate with retardation layer
  • Retardation film and polarizing plate with retardation layer
  • Retardation film and polarizing plate with retardation layer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0138] 1. Fabrication of resin film

[0139]In a reaction vessel, 47.19 parts by mass of tricyclodecane dimethanol (abbreviated as "TCDDM" below) and 81.98 parts by mass of isosorbide (hereinafter sometimes abbreviated as "ISB"), diphenyl carbonate (hereinafter sometimes abbreviated as Abbreviated as "DPC") 175.1 parts by mass and 0.979 parts by mass of cesium carbonate 0.2 mass % aqueous solution as a catalyst, under a nitrogen atmosphere, as the first stage of the reaction, heat the temperature of the heating tank to 150 ° C, stirring as needed While allowing the ingredients to dissolve (approximately 15 minutes). Next, the pressure was increased from normal pressure to 13.3 kPa, and the temperature of the heating tank was raised to 190° C. over 1 hour, and the generated phenol was taken out of the reaction vessel. After keeping the entire reaction vessel at 190°C for 15 minutes, as a second-stage process, set the pressure in the reaction vessel to 6.67kPa, raise the temper...

Embodiment 2

[0143] Except having set stretching temperature as 137.5 degreeC, it carried out similarly to Example 1, and obtained the retardation film. The wavelength dispersion value of the obtained retardation film was 1.022, the in-plane retardation Re(550) was 140nm, and the moisture permeability was 88g / m 2 ·24h, the phase difference change is 0.9%. The obtained retardation film was used for the evaluation of said (4)-(7). The results are shown in Table 1.

Embodiment 3

[0145] Except having set stretching temperature as 137 degreeC, it carried out similarly to Example 1, and obtained the retardation film. The wavelength dispersion value of the obtained retardation film was 1.022, the in-plane retardation Re(550) was 144nm, and the moisture permeability was 82g / m 2 ·24h, the phase difference change is 0.8%. The obtained retardation film was used for the evaluation of said (4)-(7). The results are shown in Table 1.

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Abstract

A retardation film is provided in which whitening and cracking are suppressed and which has excellent folding endurance. This retardation film contains a prescribed polycarbonate resin, Re(450) / Re(550) is 0.98-1.03, and Re(550) is 80-190nm.

Description

technical field [0001] The invention relates to a phase difference film and a polarizing plate with a phase difference layer. Background technique [0002] In recent years, image display devices (organic EL display devices) equipped with organic EL panels have been proposed along with the spread of thin displays. The organic EL panel has a highly reflective metal layer, which is prone to problems such as external light reflection and background reflection. Thus, it is known to prevent these problems by providing a retardation film. However, when a conventional retardation film is used for an image display device, whitening and / or cracks may occur during use, and furthermore, folding resistance may be insufficient. [0003] prior art literature [0004] patent documents [0005] Patent Document 1: Japanese Patent No. 3325560 Contents of the invention [0006] The problem to be solved by the invention [0007] The present invention was made to solve the aforementioned...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G64/02G02B5/30H01L27/32H05B33/02H01L51/50
CPCG02B5/30H05B33/02C08G64/02C08J5/18C08J2369/00
Inventor 中原步梦清水享
Owner NITTO DENKO CORP
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