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Manufacturing method of polarizing plate, polarizing plate, optical film, and image display device

A manufacturing method and technology for polarizing plates, applied in optics, polarizing elements, nonlinear optics, etc., can solve problems such as deterioration and difficulty in uniformity and optical characteristics, and achieve the effect of suppressing bubbles and not easy to wrinkle

Active Publication Date: 2018-10-26
NITTO DENKO CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in order to obtain a large polarizing plate, it is necessary to uniformly uniaxially stretch the wide raw film of the above-mentioned PVA-based film, which is actually a very difficult process, and there are simultaneous changes in the uniformity in the plane and the optical characteristics. bad trend

Method used

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  • Manufacturing method of polarizing plate, polarizing plate, optical film, and image display device
  • Manufacturing method of polarizing plate, polarizing plate, optical film, and image display device
  • Manufacturing method of polarizing plate, polarizing plate, optical film, and image display device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0103] Hereinafter, although an Example and a comparative example are used and this invention is demonstrated further more concretely, this invention is not limited to an Example and a comparative example.

[0104]

[0105] The glass transition temperature (Tg) was measured with the dynamic viscoelasticity measuring apparatus RSAIII (manufactured by TA Instruments) under the following measurement conditions.

[0106] Sample size: width 10mm, length 30mm,

[0107] Fixture distance: 20mm,

[0108] Measuring mode: stretching, frequency: 1Hz, heating rate: 5°C / min

[0109] The dynamic viscoelasticity was measured, and the temperature of the peak top of tan δ was used as Tg.

manufacture example 1

[0110] Production Example 1 Production of active energy ray-curable adhesive composition

[0111] 38.3 parts of N-hydroxyethylacrylamide (trade name: HEAA, manufactured by Kojin Co., Ltd.), 19.1 parts of tripropylene glycol diacrylate (trade name: ARONIX M-220, manufactured by Toagosei Co., Ltd.), acryloylmorpholine (trade name: ACMO, manufactured by Kohin Corporation) 38.3 parts, diethylthioxanthone (trade name: KAYACURE DETX-S, manufactured by Nippon Kayaku Co., Ltd.) as a photopolymerization initiator 1.4 parts, 2-methyl 2.9 parts of -1-(4-methylphenylthio)-2-morpholinopropan-1-one (trade name: IRGACURE907, manufactured by BASF Corporation) were mixed and stirred at 50°C for 1 hour to obtain active energy rays Curable adhesive composition.

Embodiment 1

[0113] (manufacturing of polarizers)

[0114] A PVA film (thickness: 75 μm, width: 2900 mm) having an average degree of polymerization of 2400 and a degree of saponification of 99.9 mol % was immersed in warm water at 30° C. for 60 seconds to swell.

[0115] Next, while immersing for 120 seconds in a dyeing bath filled with an iodine dyeing aqueous solution (30° C.) at a concentration of 0.3% of iodine / potassium iodide (weight ratio = 0.5 / 8), the above-mentioned PVA film was uniaxially formed relative to the original length. Stretch to a stretching ratio of 3.5 times, and at the same time dye the film.

[0116] Next, while immersing the film in a crosslinking bath filled with a 60° C. 3.25% borate aqueous solution for 20 seconds, the film was uniaxially stretched to a total stretch ratio of 6 times the original length. It should be noted that the distance L between the guide rollers in the bath 0 and the film width W immediately before stretching 0 Ratio (L 0 / W 0 ) for 3...

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Abstract

The invention aims to provide a method for manufacturing a polarizing plate, which can suppress air bubbles when an active energy-ray-curable adhesive is used for bonding a polarizer and a transparent protective film. Additionally, the invention aims to provide an optical film which comprises the polarizing plate that is prepared through the method. The method for manufacturing the polarizing plate is characterized by comprising the steps of: a step of at least performing dyeing treatment, crosslinking treatment and stretching treatment on a polyvinyl alcohol series film, and then performing drying treatment for manufacturing the polarizer; and a step of laminating the transparent protective film on at least one surface of the polarizer in a manner that an active energy-ray-curable adhesive layer is sandwiched between the transparent protective film and the surface of the polarizer; wherein in the drying treatment, the polyvinyl alcohol series film on which dyeing treatment, crosslinking treatment and stretching treatment are performed is conveyed in a preset direction and is simultaneously heated through a plurality of rollers, wherein a ratio (L1 / W1) between a distance L1 between the rollers and the width W1 of the polyvinyl alcohol series film on which drying treatment is to be performed is less than 0.4.

Description

technical field [0001] The present invention relates to a method for producing a polarizing plate, a polarizing plate produced by the production method, an optical film on which the polarizing plate is laminated, and an image display device including the optical film. Background technique [0002] Polarizing plates widely used in image display devices such as liquid crystal display devices and organic EL display devices are generally manufactured by bonding a transparent protective film to at least one surface of a polarizing plate. In addition, a polarizing plate is manufactured by orienting a dichroic substance such as iodine having dichroism or a dichroic dye in a polyvinyl alcohol (PVA)-based film. [0003] In recent years, along with the increase in size, function and brightness of liquid crystal display devices, polarizing plates used in these devices have also been required to increase in size, improve optical characteristics, and improve in-plane uniformity. However...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02B5/30G02F1/1335C09J7/30C09J4/02C09J11/06
CPCB29C55/06B29C65/483B29D7/01B29K2995/0034G02B5/30
Inventor 村山俊介中田美惠竹田哲郎山下智弘尾込大介八重樫将宽
Owner NITTO DENKO CORP