Polarizing plate and method for producing same

A manufacturing method and polarizer technology, applied in polarizing elements, identification devices, instruments, etc., can solve problems such as no prompt alternatives, and achieve the effects of improved color durability and excellent polarization degree

Pending Publication Date: 2022-07-29
SUMITOMO CHEM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Korean Laid-Open Patent No. 2009-70085 discloses a method of manufacturing a polarizer, but does not suggest an alternative to the above-mentioned problems

Method used

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  • Polarizing plate and method for producing same
  • Polarizing plate and method for producing same
  • Polarizing plate and method for producing same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0213] A transparent unstretched polyvinyl alcohol (PVA) film (PE60, KURARAY) with a saponification degree of 99.9% or more was immersed in water (deionized water) at 25° C. for 1 minute and 20 seconds to swell, and then iodine-containing Dyeing was performed by immersion in an aqueous solution for dyeing at 30°C of 1 mM / L, 1 wt % of potassium iodide and 0.3 wt % of boric acid for 2 minutes and 30 seconds. At this time, in the swelling and dyeing steps, stretching was performed at a stretching ratio of 1.56 times and 1.64 times, respectively, so that the cumulative stretching ratio after passing through the dyeing tank was 2.56 times. Then, it was immersed in an aqueous solution for crosslinking at 56° C. containing 13.9% by weight of potassium iodide, 3% by weight of boric acid, and 0.5% by weight of zinc nitrate from Oi Kakin Co., Ltd. for 26 seconds (first crosslinking step) to crosslink it. Stretching was performed at a draw ratio of 1.7 times. Then, it was immersed in an...

Embodiment 2 to 8 and comparative example 1 to 3

[0217] In addition to the composition (type and concentration), temperature, total cumulative draw ratio, and metal salt content relative to the total weight of the polarizer of the metal salt in the crosslinking liquid or the color correction liquid, as described in Tables 1 and 2 below Except for this, a polarizing plate was produced by the same method as in Example 1.

[0218] [Table 1]

[0219]

[0220] [Table 2]

[0221]

[0222] Analysis example

[0223] The distance between the crystals in the PVA of the polarizing plate manufactured in the said Example and the comparative example was measured by the following method.

[0224] (1) Distance between crystals in PVA (Long Period)

[0225] Using the Synchrotron Beam of Pohang Accelerator Institute (PAL), the distance from the sample to the detector was set to 3.0 m at the X-ray wavelength of 1.567 angstroms, and the peak of the scattering vector q was measured until the beam path 1 mm passed through the dyeing tank...

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Abstract

Provided is a polarizing plate satisfying the following equations: 0.7 < = A700 / A480 < = 1.0, A700 =-Log10 {(TMD, 700 * TTD, 700) / 10000}, A480 =-Log10 {(TMD, 480 * TTD, 480) / 10000} TMD, 700, and TTD, 700 are transmittance at a wavelength of 700 nm obtained when the polarizing plate is disposed in a state in which the absorption axis of the polarizing plate is orthogonal to linearly polarized light of measurement light and in a state in which the absorption axis is parallel to the linearly polarized light, TMD, 480, and TTD, respectively, TMD, 480, and TTD, 480 is the transmittance at a wavelength of 480 nm obtained when the polarizer is disposed in a state in which the absorption axis of the polarizer is orthogonal to the linearly polarized light of the measurement light and in a state in which the absorption axis of the polarizer is parallel to the linearly polarized light of the measurement light, respectively, and the units thereof are%.

Description

[0001] This application is a divisional application for an invention patent application with an application date of January 21, 2016, an application number of 201680006230.6, and an invention title of "polarizer and its manufacturing method". technical field [0002] The present invention relates to a polarizer and a method for producing the same. Background technique [0003] Used in various image display devices such as liquid crystal display device (LCD), electroluminescence (EL) display device, plasma display device (PDP), field emission display device (FED), organic light emitting diode (OLED), etc. The polarizing plate generally includes a polarizing plate obtained by adsorbing an iodine-based compound or a dichroic polarizing substance on a polyvinyl alcohol (PVA)-based film and orienting it, with a polarizing plate protective film laminated on one side of the polarizing plate, On the other side of the polarizer, a polarizer protective film, a pressure-sensitive adhes...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B5/30G09F9/30
CPCG02B5/30G02B5/305G09F9/30G02F1/1335G02B5/3025
Inventor 赵天熙权容铉陆根善崔允硕矢可部公彦北河佑介
Owner SUMITOMO CHEM CO LTD
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