Method for manufacturing thin polarizing film

A manufacturing method and polarizing film technology, applied in chemical instruments and methods, optics, optical components, etc., can solve the problems of insufficient polarization degree of optical properties of thin polarizing films, and achieve reduced tensile stress, excellent stretchability, and polarized light Excellent effect

Active Publication Date: 2013-05-01
NITTO DENKO CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in this method, there is a problem that the optical characteristics (such

Method used

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  • Method for manufacturing thin polarizing film
  • Method for manufacturing thin polarizing film
  • Method for manufacturing thin polarizing film

Examples

Experimental program
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Embodiment 1-1

[0080] (Process A)

[0081] As a thermoplastic resin substrate, an amorphous polyethylene terephthalate (A-PET) film (manufactured by Mitsubishi Plastics Corporation, trade name "NOVACLEAR", thickness: 100 μm) with a water absorption rate of 0.60% and a Tg of 80°C was used. .

[0082] Apply an aqueous solution of polyvinyl alcohol (PVA) resin with a degree of polymerization of 2600 and a degree of saponification of 99.9% (manufactured by Nippon Synthetic Chemical Industry Co., Ltd., trade name "GOHSENOL (registered trademark) NH-26") to the thermoplastic resin at 60°C One surface of the substrate was dried to form a PVA-based resin layer with a thickness of 7 μm. Thus, a laminated body was produced.

[0083] The obtained laminate was immersed for 30 seconds in an insolubilization bath (an aqueous boric acid solution obtained by mixing 4 parts by weight of boric acid with respect to 100 parts by weight of water) at a liquid temperature of 30° C. (insolubilization step).

[0...

Embodiment 1-2

[0090] The laminate produced in the same manner as in Example 1-1 was uniaxially stretched 2 times in the longitudinal direction (longitudinal direction) in an oven at 120° C. between rolls having different peripheral speeds (in-air auxiliary stretching step). Then, in the same manner as in Example 1-1, an insolubilization step, a dyeing step, a crosslinking step, a step B, and a washing and drying step were performed to obtain an optical film laminate.

Embodiment 2-1

[0095] In addition to using an amorphous isophthalic acid-copolyethylene terephthalate (IPA-copolyethylene PET) film (thickness: 100 μm) with a water absorption rate of 0.75% and a Tg of 75°C as the thermoplastic resin substrate, the same as the example 1-1 Perform the same operation to obtain a thin polarizing film.

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Abstract

Provided is a method for manufacturing a thin polarizing film having good optical characteristics. The method of the present invention comprises the steps of: preparing a stack (10) by forming a polyvinyl alcohol-based resin layer (12) on a thermoplastic resin base (11) having a coefficient of water absorption of between 0.2% and 3.0% and a glass transition temperature (Tg) of 60 C or greater, and drawing the stack (10) while immersed in a boric acid solution.

Description

technical field [0001] The invention relates to a method for manufacturing a thin polarizing film. Background technique [0002] In a liquid crystal display device which is a typical image display device, an optical layered body having a polarizing film is disposed on both sides of a liquid crystal cell because of an image forming method. In recent years, the thinning of optical laminates having polarizing films has been desired, and therefore a method has been proposed in which a laminate of a thermoplastic resin substrate and a polyvinyl alcohol-based resin layer (hereinafter referred to as "PVA-based resin layer") is air-coated. Stretching, and then immersing in a dyeing solution to obtain a thin polarizing film (for example, Patent Document 1). However, this method has a problem that the obtained thin polarizing film has insufficient optical properties (such as degree of polarization). [0003] prior art literature [0004] patent documents [0005] Patent Document 1...

Claims

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Application Information

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IPC IPC(8): G02B5/30B29C55/06B32B27/30B32B27/36C08J7/04G02F1/1335
CPCB29K2029/04B29C55/06B29K2995/0034G02B5/3025B29C55/026
Inventor 后藤周作喜多川丈治川本育郎泽田浩明
Owner NITTO DENKO CORP
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