Unlock instant, AI-driven research and patent intelligence for your innovation.

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

A manufacturing method and polarizing film technology, which can be applied to polarizing elements, flat products, instruments, etc., can solve problems such as insufficient optical properties of thin polarizing films, and achieve excellent optical properties and the effect of suppressing the deviation of optical properties

Pending Publication Date: 2020-06-19
NITTO DENKO CORP
View PDF13 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Polarizing plate, polarizing plate roll, and method for manufacturing polarizing film
  • Polarizing plate, polarizing plate roll, and method for manufacturing polarizing film
  • Polarizing plate, polarizing plate roll, and method for manufacturing 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] Except having dyed so that the monomer transmittance (Ts) of the polarizing film finally obtained might become 43.0% or more and less than 44.5%, it carried out similarly to Example 1, and produced 5 polarizing films and polarizing plates.

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%.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
thicknessaaaaaaaaaa
widthaaaaaaaaaa
thicknessaaaaaaaaaa
Login to View More

Abstract

Provided is a polarizing plate which has excellent optical characteristics and in which fluctuation of optical characteristics is suppressed. This polarizing plate has a polarizing film having a thickness of 8 mum or less, a unit transmittance of 44.5% or greater, and a degree of polarization of 99.0% or greater, and a protective layer disposed on at least one side of the polarizing film, the difference between the maximum value and the minimum value of the unit transmittance in a 50 cm<2> region of the polarizing plate being 0.2% or less. Another polarizing plate according to the present invention has a polarizing film having a thickness of 8 mum or less, a unit transmittance of 44.5% or greater, and a degree of polarization of 99.0% or greater, and a protective layer disposed on at leastone side of the polarizing film, the width of the polarizing plate being 1000 mm or greater, and the difference between the maximum value and the minimum value of the unit transmittance at a positionalong the width direction of the polarizing plate being 0.3% or less.

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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
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