Polarizing plate, polarizing plate roll, and method for producing polarizing film

A manufacturing method and polarizing film technology, applied in polarizing elements, flat products, applications, etc., can solve problems such as insufficient optical properties of thin polarizing films, and achieve excellent optical properties and deviation suppression effects

Pending Publication Date: 2020-05-01
NITTO DENKO CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the optical characteristics of the conventional thin polarizing film are insufficient as described above, and further improvement of the optical characteristics of the thin polarizing film is required.

Method used

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  • Polarizing plate, polarizing plate roll, and method for producing polarizing film
  • Polarizing plate, polarizing plate roll, and method for producing polarizing film
  • Polarizing plate, polarizing plate roll, and method for producing polarizing film

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0122] 1. Fabrication of polarizing film

[0123] As the thermoplastic resin substrate, a long amorphous isophthalic acid-copolymerized polyethylene terephthalate film (thickness: 100 μm) having a water absorption rate of 0.75% and a Tg of about 75° C. was used. Corona treatment was performed on one side of the resin substrate.

[0124] PVA-based resin made by mixing polyvinyl alcohol (polymerization degree 4200, saponification degree 99.2 mol%) and acetoacetyl-modified PVA (manufactured by Nippon Synthetic Chemical Industry Co., Ltd., trade name "GOHSEFIMER Z410") at a ratio of 9:1 To 100 parts by weight, 13 parts by weight of potassium iodide was added to prepare an aqueous PVA solution (coating solution).

[0125] The above-mentioned PVA aqueous solution was applied on the corona-treated surface of the resin substrate, and dried at 60° C. to form a PVA-based resin layer with a thickness of 13 μm, thereby producing a laminate.

[0126] The free end of the obtained laminate...

reference example 1

[0137] Six polarizing films and polarizing plates were produced in the same manner as in Example 1 except that dyeing treatment was performed so that the single-body transmittance (Ts) of the finally obtained polarizing film became 43% or more and less than 45%.

Embodiment 2

[0139] Four polarizing films and polarizing plates were produced in the same manner as in Example 1 except that the oven temperature was 70° C. and the heating roll temperature was 70° C. in the drying shrinkage process. The shrinkage rate of the laminated body in the width direction due to the drying shrinkage treatment was 2.5%.

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Abstract

Provided is a polarizing plate that exhibits excellent optical properties and for which variability in the optical properties is suppressed. The polarizing plate according to the present invention isa polarizing plate that has a polarizing film wherein the polarizing film is constituted of an iodine-containing polyvinyl alcohol resin film and has a thickness of not more than 8 mum, a single transmittance of at least 45%, and a degree of polarization of at least 97%, and that has a protective layer disposed on at least one side of the polarizing film, wherein the difference between the maximumvalue and the minimum value of the single transmittance in a 50 cm<2> region is not more than 0.2%. Another polarizing plate according to the present invention is a polarizing plate that has a polarizing film wherein the polarizing film is constituted of an iodine-containing polyvinyl alcohol resin film and has a thickness of not more than 8 mum, a single transmittance of at least 45%, and a degree of polarization of at least 97%, and that has a protective layer disposed on at least one side of the polarizing film, wherein the polarizing plate has a width of at least 1000 mm and the difference between the maximum value and the minimum value of the single transmittance at locations along the width direction is not more than 0.5%.

Description

technical field [0001] The present invention relates to a polarizing plate, a polarizing plate roll, and a method for manufacturing a polarizing film. Background technique [0002] With the spread of thin displays, displays equipped with organic EL panels (OLEDs) and displays using display panels using inorganic light-emitting materials such as quantum dots (QLEDs) have been proposed. These panels have a highly reflective metal layer, which is prone to problems such as reflection of external light and reflection of the background. Therefore, it is known to prevent these problems by providing a circular polarizing plate with a polarizing film and a λ / 4 wave plate on the visible side. As a method for producing a polarizing film, for example, a method has been proposed in which a laminate having a resin base material and a polyvinyl alcohol (PVA)-based resin layer is stretched, followed by dyeing to obtain a polarizing film on the resin base material. (eg Patent Document 1). ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B5/30B29C55/06B29L7/00B29L9/00B29L11/00
CPCB29C55/06G02B5/30G02B5/3041B29L2011/00
Inventor 后藤周作高永幸佑岛津亮
Owner NITTO DENKO CORP
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