Method of manufacturing polarizing film

A manufacturing method and polarizing film technology, applied in optics, optical elements, polarizing elements, etc., can solve the problems of poor appearance and curling of polarizing films, and achieve the effects of excellent appearance, shrinkage resistance, and curl suppression

Active Publication Date: 2013-06-19
NITTO DENKO CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, as described above, when a polarizing film is produced using a thermoplastic resin substrate, curling (specifically, convex curling on the side of the thermoplastic resin substrate) tends to occur during drying, which causes the resulting polarizing film poor appearance of

Method used

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  • Method of manufacturing polarizing film

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0093] An amorphous polyethylene terephthalate (IPA copolymerized PET) film (thickness: 100μm) with a crystallinity of 0 to 3.9%, a Tg of 70°C and 7 mol% of isophthalic acid units is used as a thermoplastic resin substrate .

[0094] An aqueous solution of polyvinyl alcohol (PVA) resin (manufactured by The Nippon Synthetic Chemical Industry Co., Ltd., trade name "Gohsenol (trademark) NH-26") with a degree of polymerization of 2600 and a degree of saponification of 99.9% was applied to the thermoplastic One side of the resin substrate was then dried at 60°C to form a PVA-based resin layer with a thickness of 10 μm. Thus, a laminate is produced.

[0095] In an oven at 130°C, the resulting laminate was uniaxially stretched in its longitudinal direction (length direction) (in-air stretching treatment) between rollers having different peripheral speeds. The stretching ratio at this time was set to 1.8 times.

[0096] Next, the laminate was immersed in an insolubilization bath (a boric ...

Embodiment 2

[0104] A polarizing film was produced in the same manner as in Example 1, except that the temperature of each of the conveying rollers R3 to R6 in the drying process was set to 85°C.

Embodiment 3

[0106] A polarizing film was produced in the same manner as in Example 1, except that the temperature of each of the conveying rollers R3 to R6 in the drying process was set to 90°C.

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Abstract

A method of manufacturing a polarizing film according to an embodiment of the present invention includes forming a polyvinyl alcohol-based resin layer on a thermoplastic resin substrate having a crystallinity of 7% or less to produce a laminate and subjecting the laminate to a wet treatment followed by a drying treatment with a heat roll.

Description

[0001] This application claims the priority of Japanese Patent Application No. 2011-270953 filed on December 12, 2011 in accordance with Article 119 of the U.S. Patent Law, which is incorporated herein by reference. Technical field [0002] The invention relates to a method for manufacturing a polarizing film. Background technique [0003] In a liquid crystal display device that is a typical image display device, polarizing films are provided on both sides of the liquid crystal battery, and this setting is attributed to the image forming mode of the liquid crystal display device. For example, the following method is proposed as a method of manufacturing a polarizing film (for example, JP2001-343521A). The laminate having a thermoplastic resin substrate and a polyvinyl alcohol (PVA)-based resin layer is stretched, and then immersed in a dyeing liquid to obtain a polarizing film. According to this method, a polarizing film having a small thickness is obtained. Therefore, this meth...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B5/30G02B1/10
CPCB29C55/06G02B5/3033B29K2995/0034B29C55/026B29K2629/04Y10T428/31855G02B5/30G02F1/1335G02B1/08
Inventor 森智博宫武稔上条卓史后藤周作喜多川丈治
Owner NITTO DENKO CORP
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