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Polarizing plate

a technology of polarizing plates and polarizing elements, applied in the field of polarizing plates, can solve problems such as poor external appearance, and achieve the effect of excellent external appearance and effective suppression of air bubble generation

Inactive Publication Date: 2016-02-04
NITTO DENKO CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention aims to provide an improved polarizing plate with a better external appearance. A protective layer is applied on the polarizing film through an adhesion layer, which prevents air bubble formation and ensures durability of the polarizing plate. Additionally, the percentage of bulk water absorption of the adhesion layer is set to 10 wt % or less. These technical measures result in a polarizing plate that is more robust and aesthetically pleasing to the eye.

Problems solved by technology

However, when the thickness of the polarizing film is reduced, the polarizing plate to be obtained has a problem in that its external appearance is poor.

Method used

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Examples

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example 1

Polarizing Film

[0128]As a resin substrate, there was prepared an amorphous polyethylene terephthalate (IPA-copolymerized PET) film having a thickness of 100 μm, a Tg of 75° C., and 7 mol % of an isophthalic acid unit. A surface of the film was subjected to corona treatment (58 W / m2 / min).

[0129]PVA (average polymerization degree: 4,200, saponification degree: 99.2 mol %) having added thereto 1 wt % of acetoacetyl-modified PVA (manufactured by The Nippon Synthetic Chemical Industry Co., Ltd., trade name: GOHSEFIMER 2200, average polymerization degree: 1,200, saponification degree: 98.5 mol % or more, acetoacetylation degree: 5%) was prepared, and an aqueous solution containing 5.5 wt % of the PVA-based resin was prepared. The aqueous solution was applied onto the corona-treated surface of the resin substrate so as to have a film thickness after drying of 9 μm, and was dried with hot air under an atmosphere of 60° C. for 10 minutes to form a PVA-based resin layer having a thickness of 9...

example 2

[0139]A polarizing plate was produced in the same manner as in Example 1 except that in the production of the polarizing film, a PVA-based resin layer having a thickness of 11 μm was formed on the resin substrate to form a polarizing film having a thickness of 4.7 μm.

example 3

[0140]A polarizing plate was produced in the same manner as in Example 1 except that in the production of the polarizing film, a PVA-based resin layer having a thickness of 17 μm was formed on the resin substrate to form a polarizing film having a thickness of 6.9 μm.

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Abstract

A polarizing plate according to an embodiment of the present invention includes a polarizing film having a thickness of 10 μm or less and a protective layer provided on at least one side of the polarizing film through intermediation of an adhesion layer. The adhesion layer has a thickness of 0.7 μm or more, and the adhesion layer has a percentage of bulk water absorption of 10 wt % or less.

Description

[0001]This application claims priority under 35 U.S.C. Section 119 to Japanese Patent Application No. 2014-158697 filed on Aug. 4, 2014, which are herein incorporated by references.BACKGROUND OF THE INVENTION[0002]1. Field of the Invention[0003]The present invention relates to a polarizing plate.[0004]2. Description of the Related Art[0005]A polarizing plate is used in an image display apparatus (such as a liquid crystal display apparatus). The polarizing plate generally includes a polarizing film and a protective layer for protecting the polarizing film. In recent years, it has been demanded that the image display apparatus be thinned, and in this connection, it has been demanded the polarizing plate be thinned.[0006]Incidentally, there is a proposal of a method involving forming a polyvinyl alcohol-based resin layer on a resin substrate, and stretching and dyeing the resultant laminate to provide a polarizing film (for example, Japanese Patent Application Laid-open No. 2000-338329...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): G02B5/30G02B1/14G02F1/1335
CPCG02B5/3033G02F1/133533G02B1/14G02B1/08
Inventor KITAGAWA, TAKEHARUKAMIJO, TAKASHISAITOU, TAKESHI
Owner NITTO DENKO CORP
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