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Polarizing plate with surface protective film

A surface protection film and polarizer technology, which is applied in the direction of polarizing elements, optics, instruments, etc., can solve problems such as residual display unevenness, display unevenness, and adverse effects on the display characteristics of image display devices, so as to eliminate adverse conditions and suppress display uneven effect

Active Publication Date: 2019-12-03
NITTO DENKO CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in a polarizing plate having the above-mentioned protective layer on the display unit side as a retardation film, if a surface protective film is attached, display unevenness may occur
Such display unevenness may remain after peeling and removing the surface protection film, and therefore may adversely affect the display characteristics of the final image display device.

Method used

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  • Polarizing plate with surface protective film
  • Polarizing plate with surface protective film
  • Polarizing plate with surface protective film

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0081] (1) Production of polarizer

[0082] As the resin substrate, a long amorphous isophthalic acid-copolyethylene terephthalate (IPA-copolyPET) film (thickness: 100 μm) with a water absorption rate of 0.75% and a Tg of 75°C was used. ). Corona treatment is carried out on one side of the substrate, and the corona-treated surface is coated with polyvinyl alcohol (polymerization degree 4200, saponification degree 99.2 mol%) and acetoacetyl modified at a ratio of 9:1 at 25°C. An aqueous solution of PVA (polymerization degree 1200, acetoacetyl modification degree 4.6%, saponification degree 99.0 mol% or more, manufactured by Nippon Synthetic Chemical Industry Co., Ltd., trade name "GOHSEFIMER Z200") was dried to form a PVA with a thickness of 11 μm. Resin layer, a laminated body was produced.

[0083] The obtained laminate was subjected to free-end uniaxial stretching (auxiliary stretching in gas atmosphere) by stretching 2.0 times in the longitudinal direction (longitudinal d...

Embodiment 2

[0108] use figure 2 The surface protection film (86 μm in thickness, 38 μm in thickness of the first base material, 5 μm in thickness of the first adhesive layer, 38 μm in thickness of the second base material, 38 μm in thickness of the second base material) as shown in (b) Mixture layer thickness 5 micrometers), obtained the polarizing plate with a surface protection film similarly to Example 1, and subjected the obtained polarizing plate with a surface protection film to evaluation similar to Example 1. The results are shown in Table 1.

Embodiment 3

[0110] use figure 2 (a) has a surface protection film (thickness 103 μm, base material thickness 80 μm, pressure-sensitive adhesive layer thickness 23 μm) that has one substrate (TAC film) as shown, except that, obtain tape in the same manner as in Example 1. As for the polarizing plate with a surface protection film, the obtained polarizing plate with a surface protection film was subjected to the same evaluation as in Example 1. The results are shown in Table 1.

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Abstract

The present invention addresses the problem of providing a polarizing plate with a surface protective film, said polarizing plate being capable of suppressing display unevenness when bonded to a display unit. The polarizing plate with a surface protective film according to the present invention has: a polarizer; a first protective layer and a second protective layer arranged on the two sides of the polarizer, and a surface protective film that can be temporarily attached to the side, opposite to the polarizer, of the first protective layer in a strippable mode. The second protective layer hasan in-plane phase difference Re (550) of 250 nm to 350 nm, a thickness of 30 [mu] m or less, a photoelastic coefficient of 10 * 10<-12> m<2> / N or more, and a thickness of 80 [mu] m or more.

Description

technical field [0001] The present invention relates to a polarizer with a surface protection film. Background technique [0002] In image display devices (eg, liquid crystal display devices, organic EL display devices, quantum dot display devices), due to the image forming method, in many cases, a polarizer is disposed on at least one side of the display unit. A retardation film may be laminated on the display unit side of the polarizing plate arranged on the visible side of the image display device for the purpose of preventing reflection of external light, reflection of the background, and improving hue. Along with the reduction in thickness of image display devices, reduction in thickness of polarizing plates is also strongly demanded. In order to cope with such a request, a structure in which the protective layer on the display unit side of the polarizing plate is used as a retardation film has been proposed. [0003] On the other hand, until the image display device ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B5/30G02B1/14G02B1/08
CPCG02B5/3033G02B1/14G02B1/08G02B5/30G02B1/04
Inventor 新地真规子伊崎章典林大辅
Owner NITTO DENKO CORP
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