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Method for producing polarizing plate

A manufacturing method and technology for polarizers, which can be applied to polarizers, instruments, optical elements, etc., can solve the problems of polarizer wrinkles, disappearance of film strength, and decrease in strength, and achieve improved adhesion, excellent adhesion, and improved adhesion. The effect of contact

Inactive Publication Date: 2014-12-31
KONICA MINOLTA INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Alkali saponification uses a high-temperature and high-concentration alkaline aqueous solution, so there is a problem that a part of the film is eluted in the alkali saponification solution due to alkali saponification, and the strength (rigidity) of the film is lost.
In particular, in view of the desire for thinning, if the cellulose ester film is thinned to 40 μm or less, there is a problem that the strength (rigidity) of the film will be lost during the high-temperature and high-concentration alkali saponification treatment, and the film will lose its strength (rigidity) through the adhesive process. When the adhesive is bonded to the polarizing film thinned to the above-mentioned 10 μm or less, wrinkles (wrinkles) and warpage are remarkably generated, and the yield decreases.
[0010] However, the method disclosed above is a technique for imparting hydrophilicity to a thick cellulose ester film, and if sufficient hydrophilicity is imparted to a desired cellulose ester film of a thin film of 40 μm or less, there is a problem that the thickness of the film is found. The strength (rigidity) decreases with the thermal decomposition of the film, and wrinkles and warpage occur during the production of polarizers. In addition, bubbles caused by warpage and deformation occur during panel lamination. Furthermore, the haze decreases with the heat of the film. Decomposition increases, and with this increase in haze, the front contrast in the liquid crystal display device decreases

Method used

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  • Method for producing polarizing plate
  • Method for producing polarizing plate
  • Method for producing polarizing plate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0405]

[0406]

[0407] (thermoplastic resin layer A)

[0408] The following film was prepared as the thermoplastic resin layer A.

[0409] As the crystalline ester thermoplastic resin, an amorphous polyethylene terephthalate film (A-PET) (Nobakuria manufactured by Mitsubishi Plastics Corporation, glass transition temperature 80° C.) having a film thickness of 200 μm and a length of 1000 m was used.

[0410] (hydrophilic polymer layer)

[0411] Polyvinyl alcohol powder as a hydrophilic polymer (manufactured by Japan VAM POVAL Co., Ltd., average polymerization degree 2500, saponification degree 99.0 mol% or more, trade name: JC-25) was dissolved in hot water at 95°C to prepare An aqueous solution of polyvinyl alcohol having a concentration of 8% by mass. The obtained polyvinyl alcohol aqueous solution was coated on the above-mentioned thermoplastic resin layer A for lamination using a lip coater, and dried at 80°C for 20 minutes to prepare a laminate composed of the ther...

Embodiment 2

[0524]

[0525] The polarizing plates 301 and 302 were fabricated by the following steps.

[0526] Step 1: A PET film having a film thickness of 100 μm was bonded as a separator to the hydrophilic polymer layer side of the stretched laminate 1 having the polarizing film (A) prepared above via an adhesive.

[0527] Step 2: Peeling the thermoplastic resin layer A from the stretched laminate 1 .

[0528] Process 3: The polarizing film (A) with a separator was immersed in the polyvinyl alcohol adhesive agent tank of 2 mass % of solid content for 1 to 2 second.

[0529] Step 4: Gently wipe off the excess adhesive attached to the polarizing film (A) with separator in Step 3, and then, the hydrophilized cellulose ester film 105-3 produced in Example 1 and The hydrophilized surface of 107 is arranged on the polarizing film (A).

[0530] Step 5: Apply the laminated film in step 4 to a pressure of 20-30N / cm 2 , The conveying speed is about 2m / min.

[0531] Step 6: The sample produ...

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Abstract

The problem of the present invention is to obtain excellent adhesiveness between a thin film as a polarizing film and a thin film as a protective film and thereby provide a method for producing a thin film polarizing plate by means of which adhesiveness with the polarizing film is excellent but there is no wrinkling or curling during polarizing plate production, generation of air bubbles due to curling or deformation when the polarizing film panels are bonded, or rise in haze or accompanying reduction in front surface contrast of the liquid crystal display device. The method for producing a polarizing plate of the present invention is a method for producing a polarizing plate whereby a polarizing film (A) having a hydrophilic polymer layer dyed by a dichroic substance and a cellulose ester film (B) are laminated via an adhesive agent on at least one surface of the polarizing film (A), characterized in that the cellulose ester film (B) is subjected to hydrophilization by either plasma treatment or corona treatment, and the surface free energy before and after hydrophilization treatment of the cellulose ester film (B) is a value within a predetermined range.

Description

technical field [0001] The invention relates to a method for manufacturing a polarizer. In more detail, it is related with the manufacturing method of the thinned polarizing plate. Background technique [0002] In recent years, the market for liquid crystal displays and thin displays using organic electroluminescence is rapidly expanding. In particular, the market for small and medium-sized mobile devices called smartphones and pads is expanding significantly. [0003] Small and medium-sized mobile devices require thinner and lighter devices while improving the contrast of displayed images. Therefore, reduction in thickness of each member constituting the display device has become a major issue. [0004] As one of the methods for solving the above-mentioned problems, it is desired to reduce the thickness of the polarizing plate as a component, and it is required to reduce the thickness of the polarizing film and the polarizing film protective film which are the constituen...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B5/30C08J7/00G02F1/1335C08J7/043C08J7/056
CPCC08J2301/02G02B5/3033C08J7/043C08J7/056C08J7/00G02B5/30G02F1/1335
Inventor 笠原睦美
Owner KONICA MINOLTA INC
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