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Method for manufacturing polarized laminated film and method for manufacturing polarizing plate

A manufacturing method, a technology for laminating films, applied in polarizing elements, chemical instruments and methods, coatings, etc., can solve problems such as difficulty and film breakage, and achieve the effect of suppressing wrinkles and good optical properties

Inactive Publication Date: 2015-06-24
SUMITOMO CHEM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It is difficult to make thin films above that because of productivity problems such as film breakage during stretching.

Method used

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  • Method for manufacturing polarized laminated film and method for manufacturing polarizing plate
  • Method for manufacturing polarized laminated film and method for manufacturing polarizing plate
  • Method for manufacturing polarized laminated film and method for manufacturing polarizing plate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0187] (1) Production of substrate film

[0188]By co-extrusion molding using a multilayer extrusion molding machine, a random copolymer of propylene / ethylene containing about 5% by weight of ethylene units ("Sumitomo Noblen W151" manufactured by Sumitomo Chemical Co., Ltd., melting point Tm = 138°C) on both sides of a resin layer consisting of a propylene homopolymer ("Sumitomo Noblen FLX80E4" manufactured by Sumitomo Chemical Co., Ltd., melting point Tm = 163°C) is a long substrate with a three-layer structure. material film. The total thickness of the base film was 100 μm, and the thickness ratio (FLX80E4 / W151 / FLX80E4) of each layer was 3 / 4 / 3.

[0189] (2) Production of laminated film (resin layer formation process)

[0190] Polyvinyl alcohol powder (“Z-200” manufactured by Nippon Synthetic Chemical Industry Co., Ltd., average degree of polymerization 1100, average degree of saponification 99.5 mol%) was dissolved in hot water at 95°C to prepare polyethylene with a concen...

Embodiment 2

[0204] A polarizing plate was produced in the same manner as in Example 1, except that the draw ratios of the first-stage and second-stage stretch treatments were 2.50 times and 2.32 times (total draw ratio 5.80 times), respectively. The thickness of the polyvinyl alcohol-type resin layer in a stretched film was 4.8 micrometers on one side, and 5.0 micrometers on the other side. Wrinkles were not observed in the stretched film, and the thickness difference in the film width direction was 2 μm, and the stretching was performed uniformly. The bonding step and the peeling step were also carried out without any problem, and a polarizing plate on which a protective film was laminated could be obtained.

Embodiment 3

[0206] A polarizing plate was produced in the same manner as in Example 1, except that the draw ratios in the first-stage and second-stage stretch treatments were 2.80 times and 2.07 times (total draw ratio 5.80 times), respectively. The thickness of the polyvinyl alcohol-type resin layer in a stretched film was 5.2 micrometers on one side, and 5.4 micrometers on the other side. Wrinkles were not observed in the stretched film, and the thickness difference in the width direction of the film was 2 μm, and the stretching was performed uniformly. The bonding step and the peeling step were also carried out without any problem, and a polarizing plate on which a protective film was laminated could be obtained.

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Abstract

A method for manufacturing a polarized laminated film provided with a resin-layer-forming step for obtaining a laminated film by coating a substrate film with a coating liquid containing a polyvinyl alcohol resin, a drawing step for obtaining a drawn film by longitudinal uniaxial drawing of the laminated film, and a dyeing step for dyeing the polyvinyl alcohol resin layer of the drawn film with a dichroic dye to form a polarizer layer; and a method for manufacturing a polarizing plate using the polarized laminated film obtained by said method. The drawing step includes two or more drawing process steps, the draw ratio used in the first drawing process step is at least 50% of the draw ratio used in the second drawing process step and the total draw ratio of the polarizer layer is greater than 500%.

Description

technical field [0001] The present invention relates to a method for producing a polarizing laminated film and a method for producing a polarizing plate. Background technique [0002] A polarizing plate is widely used as a polarized light supply element in a liquid crystal display device and as a polarized light detection element. In the past, polarizers were mainly used as polarizers in which a protective film made of triacetyl cellulose or the like was bonded to a polarizing film made of polyvinyl alcohol-based resin through an adhesive. In recent years, with liquid crystal display The development of devices into mobile devices such as notebook computers and mobile phones, and the development of large-scale TVs require thinner and lighter polarizers. [0003] However, the polarizing film is produced by stretching and dyeing a polyvinyl alcohol-based resin film raw material (usually about 75 μm in thickness), and the stretched film thickness is usually about 30 μm. It is ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B5/30B32B7/02B32B27/30
CPCC09D129/00G02B5/3033C09D129/04
Inventor 河村真一
Owner SUMITOMO CHEM CO LTD
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