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Manufacturing method of polarizing film, polarizing film and polarizing plate

A manufacturing method and technology of polarizing film, applied in the field of polarizing plates, can solve problems such as production interruption, reduction of polarizing performance of polarizing film, film breakage, etc., and achieve the effect of avoiding folding and reducing uneven color

Active Publication Date: 2021-01-12
MITSUBISHI CHEM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, in the production steps of water swelling, dyeing, stretching, boric acid crosslinking, and drying, the film absorbs water or dehydrates and curls, and folds and wrinkles occur at the ends of the film in the width direction. membrane problem
Especially when the film is thin, there is a problem that the film breaks and production is interrupted due to the above-mentioned folding and wrinkling.
Furthermore, the problem of the above-mentioned edge portion also affects the inside of the polarizing film, and becomes a cause of a decrease in the polarizing performance of the entire polarizing film, difficulty in uniformly mounting the polarizing plate in the liquid crystal cell, or color unevenness and white leakage of the liquid crystal display image.

Method used

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  • Manufacturing method of polarizing film, polarizing film and polarizing plate
  • Manufacturing method of polarizing film, polarizing film and polarizing plate
  • Manufacturing method of polarizing film, polarizing film and polarizing plate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0110] (Manufacture of polyvinyl alcohol-based film)

[0111] Add 1,000 kg of polyvinyl alcohol-based resin with a weight average molecular weight of 142,000 and a degree of saponification of 99.8 mol%, 2,500 kg of water, and 100 kg of glycerin as a plasticizer, and heat up to 140° C. while stirring, and adjust the concentration to a resin concentration of 25% by weight to obtain a uniform Dissolved polyvinyl alcohol-based resin aqueous solution.

[0112] Next, after supplying this aqueous solution of polyvinyl alcohol-based resin to a twin-screw extruder having vent holes for defoaming, the temperature of the aqueous solution was set at 95° C., and cast at a discharge speed of 0.6 m / min from a discharge port of a T-shaped slit die. Film formation was performed on a casting drum with a surface temperature of 90°C.

[0113] Next, the obtained film was dried with a plurality of hot rolls, heat-treated at 120° C. for 3 minutes using a float dryer, and cut to a width of 4 m by sl...

Embodiment 2～4

[0129] In Example 1, except that the spraying conditions were the conditions shown in Table 1, it carried out similarly to Example 1, and obtained the polarizing film. The obtained polarizing film had no folding or wrinkling, and did not break for a length of 12 km. The same evaluation as in Example 1 was performed about the obtained polarizing film. The evaluation results are shown in Table 1. Furthermore, a polarizing plate was obtained in the same manner as in Example 1. In the obtained polarizing plate, no polarization unevenness was observed.

Embodiment 5

[0131] In Example 1, except having made water into a mist state, it carried out similarly to Example 1, and obtained the polarizing film. The spraying conditions of the above-mentioned mist are as follows.

[0132] Nozzle: HITJET nozzle manufactured by Spraying Systems Co.

[0133] Nozzle position: 1m from the outlet of the water swelling tank

[0134] Nozzle position (height): 5mm from the upper surface of the film

[0135] Jet velocity: 0.1m / s

[0136] Spray angle θ1: 30°

[0137] Spray angle θ2: 45°

[0138] Fog particle size: 20μm

[0139] Fog flow: 0.2L / min

[0140] The same evaluation as in Example 1 was performed about the obtained polarizing film. The evaluation results are shown in Table 1. Furthermore, a polarizing plate was obtained in the same manner as in Example 1. In the obtained polarizing plate, no polarization unevenness was observed.

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Abstract

An object of the present invention is to solve the problems of folding and wrinkling in all the manufacturing steps of the polarizing film, and to manufacture a polarizing film with less polarization unevenness with good productivity. A method for producing a polarizing film, comprising: 1) a step of unwinding a polyvinyl alcohol-based film from a roll and transferring it in a horizontal direction, 2) a water swelling step, 3) a dyeing step, and 4) stretching In the step and 5) the boric acid crosslinking step, before and / or after any of the steps 2) to 4), the film is sprayed with liquid to both ends in the width direction of the film to prevent curling of the film.

Description

technical field [0001] The present invention relates to a method for producing a polarizing film used in liquid crystal display devices (hereinafter sometimes referred to simply as LCD), a polarizing film, and a polarizing plate. A method for manufacturing a polarizing film, a polarizing film manufactured by the manufacturing method, and a polarizing plate using the polarizing film. Background technique [0002] LCDs are used in personal digital assistants, liquid crystal televisions, desktop computers, electronic clocks, personal computers, automatic word processing machines, automobiles, mechanical measuring instruments, etc., and the LCD uses a polarizing plate. As a polarizing plate, a polarizing plate formed by laminating a protective film such as triacetyl cellulose on one or both sides of a polarizing film formed by adsorbing and aligning a polyvinyl alcohol film with iodine or a dichroic dye is generally used. 1. LCDs with high contrast require polarizers with both ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02B5/30B29C55/02G02F1/1335H01L51/50H05B33/02B29L7/00B29L11/00
CPCB29C55/02G02F1/1335G02B5/30H05B33/02B29C55/026B29D11/0074G02B5/3033
Inventor 枝泽敏行早川诚一郎
Owner MITSUBISHI CHEM CORP
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