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Laminate and method for manufacturing polarizing plate with phase difference layer

A technology of retardation layer and manufacturing method, applied in polarizing elements, chemical instruments and methods, layered products, etc., can solve the problem of warping of polarizers, and achieve the effect of warping suppression

Pending Publication Date: 2022-07-08
NITTO DENKO CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, polarizers with thin retardation layers have the problem of warping easily

Method used

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  • Laminate and method for manufacturing polarizing plate with phase difference layer
  • Laminate and method for manufacturing polarizing plate with phase difference layer
  • Laminate and method for manufacturing polarizing plate with phase difference layer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0128] (Production of polarizer)

[0129] As a thermoplastic resin base material, a long amorphous copolyethylene terephthalate film (thickness: 100 μm) with a Tg of about 75°C was used, and one side of the resin base material was subjected to Corona treated.

[0130] 100 weight of PVA-based resins obtained by mixing polyvinyl alcohol (degree of polymerization 4200, degree of saponification 99.2 mol%) and acetoacetyl-modified PVA (manufactured by Nippon Synthetic Chemical Industry Co., Ltd., trade name "GOHSEFIMER") in a ratio of 9:1 To the part, 13 parts by weight of potassium iodide was added, and the obtained substance was dissolved in water to prepare an aqueous PVA solution (coating liquid).

[0131] The above-mentioned PVA aqueous solution was applied to 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.

[0132] In an oven at 130° C., the obtained laminate was u...

Embodiment 2

[0156] In the production of the laminate, a surface protective film with a thickness of 60 μm (a PET film (thickness 50 μm, moisture permeability 13 g / m) was bonded to the protective layer side of the polarizing plate of the laminate precursor. 2 24h) Except having formed the adhesive layer (film of thickness 10 micrometers) on 24h), it carried out similarly to Example 1, and obtained the laminated body.

Embodiment 3

[0158] In the production of the laminate, a surface protective film with a thickness of 60 μm (a PET film (thickness 50 μm, moisture permeability 13 g / m) was bonded to the protective layer side of the polarizing plate of the laminate precursor. 2 24h) A film with an adhesive layer (thickness 10 μm) formed on it), and a separator ( PET film, thickness 75μm, moisture permeability 10g / m 2 24h), it carried out similarly to Example 1, and obtained the laminated body.

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Abstract

The present invention provides a polarizing plate with a phase difference layer in which warpage is suppressed. A laminate according to an embodiment of the present invention has, in this order, a first protective film, a polarizing plate including a polarizer and a protective layer disposed on at least one side of the polarizer, a retardation layer, and a second protective film, the sum of the thickness of the polarizing plate and the thickness of the retardation layer being 70 [mu] m or less, and the sum of the thickness of the polarizing plate and the thickness of the retardation layer being 70 [mu] m or less. The center of the polarizer in the thickness direction is within the range of 10% or less of the half thickness of the laminate from the center of the laminate in the thickness direction.

Description

technical field [0001] The present invention relates to a laminate and a method for producing a polarizing plate with a retardation layer. Background technique [0002] Image display devices represented by liquid crystal display devices and electroluminescence (EL) display devices (eg, organic EL display devices, inorganic EL display devices) are rapidly spreading. The image display device typically uses a polarizing plate and a retardation plate. Practically, a polarizing plate with a retardation layer obtained by integrating a polarizing plate and a retardation plate is widely used (for example, Patent Document 1). In recent years, the possibility of realizing bending, bending, folding, and winding of an image display device using a flexible substrate (eg, a resin substrate) has been studied. As a polarizing plate with a retardation layer used for such an image display device, a polarizing plate with a thin retardation layer is required. However, a polarizing plate with...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B5/30G02B1/14
CPCG02B5/3083G02B5/305G02B5/3016G02B1/14B32B7/023B32B7/12B32B15/04
Inventor 朝永政俊后藤周作
Owner NITTO DENKO CORP