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Manufacturing method of polarizing plate

A manufacturing method and polarization technology, applied in the direction of polarizing components, instruments, optical components, etc., can solve problems such as prone to curling, and achieve the effect of suppressing curling

Active Publication Date: 2020-09-22
SUMITOMO CHEM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there is a problem that curling tends to occur when the polarizing plate is thinned

Method used

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  • Manufacturing method of polarizing plate
  • Manufacturing method of polarizing plate
  • Manufacturing method of polarizing plate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0147] (1) Primer layer formation process

[0148] Polyvinyl alcohol powder (“Z-200” manufactured by Nippon Synthetic Chemical Industry Co., Ltd., average degree of polymerization 1100, degree of saponification 99.5 mol%) was dissolved in hot water at 95°C to prepare polyethylene with a concentration of 3% by weight. alcohol solution. To the obtained aqueous solution, a crosslinking agent ("Sumirez Resin 650" manufactured by Tagoka Chemical Industry Co., Ltd.) was mixed in a ratio of 5 parts by weight to 6 parts by weight of polyvinyl alcohol powder to obtain a coating for forming a primer layer. liquid.

[0149] Next, an unstretched polypropylene (PP) film (melting point: 163° C.) with a thickness of 110 μm was prepared as a base film, and after corona treatment was applied to one side thereof, it was coated with a micro-gravure coater on the corona-treated side. The coating liquid for forming a primer layer was dried at 80° C. for 10 minutes to form a primer layer with a t...

Embodiment 2

[0161]

[0162] A polarizing plate with a protective film on one surface was produced in the same manner as in Example 1 except that the drying conditions of the adhesive layer were as shown in Table 1.

[0163] [Measurement and Evaluation of Curl Amount of Polarizing Plate]

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Abstract

The present invention provides a method for producing a polarizing plate, which sequentially includes: a bonding step of bonding a polarizing layer of a polarizing laminated film having a polarizing layer on at least one surface of a base film with an adhesive layer interposed therebetween. a protective film; a drying step of drying the adhesive layer by heat treatment in an environment with a relative humidity of 25% or more; and a step of peeling and removing the base film.

Description

technical field [0001] The invention relates to a method for manufacturing a polarizing plate. Background technique [0002] Polarizing plates are widely used in display devices such as liquid crystal display devices, especially in thin TVs and various mobile devices in recent years. The polarizing plate generally has a configuration in which a protective film is bonded to one or both sides of a polarizing plate using an adhesive. [0003] The polarizing plate can be manufactured by a method (hereinafter also referred to as "monomer film method") of laminating a protective film on a polarizer (polarizing film) including a monomer (individual) film via an adhesive layer. Manufactured by the following method (hereinafter also referred to as "coating method"), which includes: the process of forming a resin layer on the base film by coating; making the resin layer polarized by stretching and dyeing Sheet layer, the process of obtaining a polarizing laminated film; the process ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02B5/30
CPCG02B5/3033B29C55/005C08J7/04C08L1/10C08L33/08C09D129/04G02B1/04G02B1/14
Inventor 小林直子
Owner SUMITOMO CHEM CO LTD