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Polarizing plate, method of manufacturing the same, optical film and image display apparatus

A manufacturing method and polarizing plate technology, applied in the direction of optics, lamination devices, polarizing elements, etc., can solve problems such as reddening, unsatisfactory durability, low transmittance, etc., achieve good dimensional stability, suppress production costs, The effect of high-speed production

Active Publication Date: 2011-09-21
NITTO DENKO CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in a polarizing plate in which a polyvinyl alcohol-based polarizer and a transparent protective film are bonded together using an active energy ray-curable adhesive, a significant decrease in transmittance or reddening is observed under heating conditions, and it cannot meet high temperature requirements. Under the durability

Method used

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  • Polarizing plate, method of manufacturing the same, optical film and image display apparatus
  • Polarizing plate, method of manufacturing the same, optical film and image display apparatus

Examples

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Effect test

Embodiment 1

[0165] (polarizer)

[0166] Immerse a polyvinyl alcohol film with an average degree of polymerization of 2400, a degree of saponification of 99.9 mol%, and a thickness of 75 μm in warm water at 30°C for 60 seconds to swell it, and then uniaxially stretch it in water (the draw ratio is 3.5 times) ). Next, dyeing was carried out for 60 seconds in a 30°C iodine solution having a concentration of 0.3% by weight (weight ratio: iodine / potassium iodide=0.5 / 8). Then, dip for 45 seconds in the first boric acid aqueous solution (boric acid concentration is 3% by weight, potassium iodide concentration is 3% by weight) at 40°C, and then, in the second boric acid aqueous solution (boric acid concentration is 4% by weight, potassium iodide concentration 5% by weight and anhydrous sodium sulfate concentration of 2% by weight) while being immersed for 30 seconds until the total stretching ratio becomes 6 times. Then, it was immersed in 30 degreeC potassium iodide aqueous solution (potassium...

Embodiment 2

[0176] In Example 1, when preparing a polarizing plate, the anhydrous sodium sulfate in the second boric acid aqueous solution of 2% by weight was replaced with 2% by weight of zinc sulfate heptahydrate, except that it was carried out in the same manner as in Example 1 to obtain Polarizing plate.

Embodiment 3

[0178] In Example 1, when preparing a polarizing plate, the anhydrous sodium sulfate in the 2% by weight of the second boric acid aqueous solution was replaced by 2% by weight of anhydrous magnesium sulfate. plate.

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Abstract

The invention provides a polarizing plate including a polarizer and a transparent protective film bonded together with an active energy ray-curable adhesive and having durability at high temperature. The polarizing plate is a polarizing plate that the transparent protective film is placed on at least one side of a polarizer and an adhesive layer interposed between the polarizer, which is characterized in that the polarizer is a stretched polyvinyl alcohol film dyed with a dichroic material and containing a sulfate ion, and the adhesive layer is formed with an active energy ray-curable adhesive containing at least one curable component.

Description

[0001] This application is a divisional application of 200910002519.2. The filing date of the original application is January 16, 2009. The invention name of the original application is polarizing plate, its manufacturing method, optical film and image display device. technical field [0002] The present invention relates to a polarizing plate and a manufacturing method thereof. This polarizing plate can be used alone or as an optical film laminated to form an image display device such as a liquid crystal display device (LCD), an organic EL display device, a CRT, or a PDP. Background technique [0003] Liquid crystal display devices are rapidly spreading in the market for clocks, mobile phones, PDAs, notebook computers, monitors for personal computers, DVD players, TVs, and the like. A liquid crystal display device visualizes a polarization state by switching of liquid crystals, and a polarizing plate can be used according to the display principle. In particular, applicatio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B5/30B32B37/12B32B27/08G02F1/1335
Inventor 八重樫将宽池田哲朗中野勇树赤利玲子铃木畅尾迂大介
Owner NITTO DENKO CORP
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