Preparing method for polarizer

A manufacturing method and technology for polarizers, applied in optics, instruments, optical components, etc., can solve the problems of uneven content of dichroic substances, uneven phase difference, uneven dyeing, etc., and achieve less uneven dyeing and positive The effect of high cross b value and excellent color sense

Active Publication Date: 2016-10-05
DONGWOO FINE CHEM CO LTD
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  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

[0003] For the polarizer constituting the polarizing plate of this structure, although it is manufactured through the complicated processes of swelling (swelling), dyeing, stretching, cross-linking, cleaning and drying of the PVA film, due to the above-mentioned In the swelling step (stage), water is absorbed and swells, so wrinkles are generated in the direction (MD) of the film and in the direction (TD) perpendicular to the direction of the film
This wrinkle causes uneven phase difference (stain), uneven content of dichroic substances, and becomes the cause of uneven dyeing
[0004] In addition, in order to increase the transmittance, the content of the dichroic substance is reduced, but there is a problem that the above-mentioned uneven dyeing phenomenon is further strengthened, and it becomes a main cause of visibility hindrance.
[0006] In Korean Laid-Open Patent No. 2009-82197, a polarizer protective film, a polarizing plate, and an image display device are disclosed, but a corresponding solution to the above problems cannot be proposed

Method used

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  • Preparing method for polarizer
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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0104] A transparent unstretched polyvinyl alcohol film (PE60, average polymerization degree of 2400, KURARAY company) with a length and width of 100 cm, a thickness of 30 μm, and a degree of saponification of 99.9% or more was placed in water (deionized water) at 25°C. After soaking for 1 minute and 20 seconds to make it swell, immerse in a 30°C dyeing aqueous solution containing 1.25mM / L iodine, 1.25% by weight potassium iodide, and 0.3% by weight boric acid for 2 minutes and 30 seconds for dyeing. At this time, in the swelling step and the dyeing step, the stretching ratios of 1.56 times and 1.64 times were stretched respectively, and the cumulative stretching ratio up to the dyeing tank (that is, the stretching ratio of the swelling step and the stretching ratio of the dyeing step Stretching was carried out in such a way that the product of the stretching ratio reached 2.56 times.

[0105] Next, immerse in a cross-linking aqueous solution at 59°C containing 11% by weight o...

Embodiment 2～16 and comparative example 1～5

[0109] A polarizer was manufactured in the same manner as in Example 1 except that the preheat treatment and drying conditions shown in Table 1 below were changed.

[0110] Table 1

[0111]

experiment example

[0113] 1. Determination of transmittance and orthogonal b

[0114] The polarizers produced in Examples and Comparative Examples were cut into a size of 4 cm×4 cm, and the transmittance and cross b were measured using an ultraviolet-visible ray spectrometer (V-7100, JASC Corporation). Usually, when the orthogonal b value is -1.0 or less, uneven dyeing is observed.

[0115] 2. Determination of degree of polarization

[0116] The polarizers manufactured in Examples and Comparative Examples were cut into a size of 4 cm×4 cm, and the transmittance was measured using an ultraviolet-visible ray spectrometer (V-7100, JASC Corporation). At this time, the degree of polarization is defined by Mathematical Expression 1 below.

[0117] [mathematical formula 1]

[0118] Degree of polarization (P) = [(T 1 -T 2 ) / (T 1 +T 2 )] 1 / 2

[0119] (where, T 1 It refers to the parallel transmittance obtained when a pair of polarizers are arranged in a state in which the absorption axes are pa...

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Abstract

The invention relates to a preparing method for a polarizer. The method can manufacture a polarizer with a high quadrature b value, few uneven dyeing phenomena, and an improved polarization degree due to containing more I3-containing complex. The method steps of swelling, dyeing, stretching, crosslinking, color complementing, water washing, and drying the polarizer forming film. A thermal pretreatment steps is included between the color complementing and water washing stepes.

Description

technical field [0001] The invention relates to a method for manufacturing a polarizer (polarizer). Background technique [0002] For polarizers used in various image display devices such as liquid crystal display (LCD), electroluminescence (EL) display, plasma display (PDP), field emission display (FED), OLED, etc., usually Contains a polarizer made by adsorbing and aligning iodine compounds or dichroic polarizing substances on a polyvinylalcohol (PVA) film, and has the following multilayer structure: sequentially stacked on one side of the polarizer There is a polarizer protective film, and on the other surface of the polarizer, a polarizer protective film, an adhesive layer bonded to the liquid crystal cell, and a release film are laminated in this order. [0003] For the polarizer constituting the polarizing plate of this structure, although it is manufactured through the complicated processes of swelling (swelling), dyeing, stretching, cross-linking, cleaning and dryin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B5/30
CPCG02B5/30G02B5/3025
Inventor 赵天熙权容铉朴重万崔允硕崔正宁金孝东陆根善
Owner DONGWOO FINE CHEM CO LTD
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