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Polarizer protecting film, polarizing plate and image display

A technology for protecting films and polarizers, applied to polarizing elements, electronic equipment, applications, etc., can solve problems such as floating or streaks, low productivity, and insufficient polarization characteristics, and achieve good polarization characteristics, high productivity, and good appearance Effect

Inactive Publication Date: 2007-04-18
NITTO DENKO CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in this method, when the protective film and the polyvinyl alcohol-based polarizer are bonded, floating or streaks appear, the appearance is unstable, the polarization characteristics are not sufficient, and there is also a problem of low productivity.

Method used

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  • Polarizer protecting film, polarizing plate and image display
  • Polarizer protecting film, polarizing plate and image display
  • Polarizer protecting film, polarizing plate and image display

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0110] (polarizer)

[0111] A polyvinyl alcohol film having a thickness of 80 μm was dyed in a 5% by weight (weight ratio: iodine / potassium iodide=1 / 10) iodine aqueous solution. Next, it is immersed in an aqueous solution containing 3% by weight of boric acid and 2% by weight of potassium iodide, and then stretched to 5.5 times in an aqueous solution containing 4% by weight of boric acid and 3% by weight of potassium iodide, and then dipped to 5% by weight. % potassium iodide aqueous solution. Subsequently, drying was performed for 3 minutes in a drying oven at 40° C. to obtain a polarizer having a thickness of 3 μm.

[0112] (Production of protective film with copolymer resin layer)

[0113] To three extruders connected to the T-die head and set at a temperature of 250° C., cyclic olefin-based resins (manufactured by TICONA, Topas 6013) and adhesive resins (Mitsui Chemicals ( Co., Ltd., Adoma-PF508), styrene-butadiene copolymer (Denki Kagaku Kogyo Co., Ltd., Clearen 530L),...

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Abstract

A polarizer protective film of the present invention comprises a thermoplastic resin layer having a moisture permeability of 100 g / m2 / 24 hours or less; and a resin layer that comprises a copolymer containing a styrene monomer unit and is laminated on the thermoplastic resin layer through an adhesive resin layer. The polarizer protective film can have good adhesion to a polarizer when it is bonded to the polarizer through an adhesive layer to form a polarizing plate, and can form a polarizing plate with good polarization properties.

Description

technical field [0001] The present invention relates to a polarizer protective film and a polarizer using the protective film. The polarizing plate can be used alone or as an optical film laminated with the polarizing plate to constitute an image display device such as a liquid crystal display device, an organic EL display device, or a PDP. Background technique [0002] In a liquid crystal display device or the like, it is indispensable to arrange polarizing plates on both sides of a glass substrate forming the surface of a liquid crystal panel due to its image forming method. A polarizer is generally used in which a protective film is bonded to both sides of a polarizer made of a polyvinyl alcohol-based film and a dichroic material such as iodine with a polyvinyl alcohol-based adhesive. , Triacetyl cellulose and the like are used in the protective film. [0003] However, triacetyl cellulose does not have sufficient heat and humidity resistance, and when a polarizing plate...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B5/30B32B27/30G02F1/1335B32B7/12B32B27/08
CPCB32B2307/306B32B2457/20G02B1/105B32B7/12B32B27/306B32B27/08B32B25/08B32B2551/00B32B2457/202B32B25/14G02B5/30B32B27/325B32B2307/42B32B2457/204B32B2457/206B32B2307/724B32B27/16G02B5/305G02B1/14B32B27/30G02F1/1335
Inventor 辻内直树西田昭博与田健治江原启悟栗栖洋武居芳树每田知正
Owner NITTO DENKO CORP
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