Optical film, polarizing plate, and method for manufacturing optical film

A technology of optical film and manufacturing method, which is applied in the direction of optics, optical elements, polarizing elements, etc., can solve the problems of optical film hue change, damage to display quality, appearance deterioration, etc. Excellent adhesion effect

Pending Publication Date: 2022-03-25
NITTO DENKO CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, when such a polarizing plate with high light transmittance is used in a display, there is a problem that the appearance deteriorates under humid conditions
[0003] Furthermore, in recent years, displays have been increasingly used in environments exposed to ultraviolet light (such as PID (public information display), mobile phones), and especially for polarizers with optical films disposed on the panel side, there are cases where the optical film is damaged by ultraviolet light. Hue changes that impair the quality of the monitor

Method used

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  • Optical film, polarizing plate, and method for manufacturing optical film
  • Optical film, polarizing plate, and method for manufacturing optical film
  • Optical film, polarizing plate, and method for manufacturing optical film

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0118] 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 temperature of the heating tank to 230°C ove...

Embodiment 2

[0120] An optical film was obtained in the same manner as in Example 1 except that the film forming line speed was 8 m / min and the thickness was 30 μm. The degree of orientation of the obtained optical film was 5.7%, and the in-plane retardation Re(550) was 3 nm. The obtained optical film was subjected to the same evaluation as in Example 1. The results are shown in Table 1.

Embodiment 3

[0122] An optical film was obtained in the same manner as in Example 1, except that the birefringence Δnxy of the polycarbonate resin was 0.018, the film-forming linear velocity was 10 m / min, and the thickness was 20 μm. The degree of orientation of the obtained optical film was 6.1%, and the in-plane retardation Re(550) was 2 nm. The obtained optical film was subjected to the same evaluation as in Example 1. The results are shown in Table 1.

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PUM

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Abstract

The invention provides an optical film, a polarizing plate and a method for manufacturing the optical film. Provided are: an optical film which suppresses a change in phase difference in a humidification reliability test, suppresses a change in hue in a weather resistance test in an ultraviolet region, and has excellent adhesiveness; and a polarizing plate comprising the optical film. An optical film which is composed of a resin having birefringence within a predetermined range and has a degree of orientation of 5% or more is used.

Description

technical field [0001] The invention relates to an optical film, a polarizing plate and a manufacturing method of the optical film. Background technique [0002] In the display market in recent years, there is a need to reduce the brightness of the display in order to prolong the endurance time of the battery and suppress heat generation. Therefore, as a polarizing plate used for a display, a polarizing plate with high light transmittance is required. However, when such a polarizing plate with high light transmittance is used for a display, there is a problem that the appearance deteriorates under humidified conditions. [0003] Furthermore, in recent years, displays have been increasingly used in environments exposed to ultraviolet light (such as PID (public information display), mobile phones), and especially for polarizers with optical films disposed on the panel side, there is a risk that the optical film will be damaged by ultraviolet light. Hue changes that impair th...

Claims

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Application Information

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IPC IPC(8): G02B1/04G02B5/30C08G64/30C08L69/00C08J5/18
CPCG02B1/04G02B5/3083C08G64/305C08J5/18C08J2369/00G02B5/3033C08G64/02
Inventor 中原步梦
Owner NITTO DENKO CORP
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