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Polarizing plate and image display using same

A polarizer and polarizer technology, applied in the field of image display devices, can solve the problems of poor pass rate, lack of productivity, unstable appearance of polarizers, etc., and achieve the effects of excellent adhesion, excellent durability, and excellent appearance.

Inactive Publication Date: 2007-10-24
NITTO DENKO CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in this polarizer, there is a problem that a large amount of floating or streaks occur when the protective film is bonded to the PVA polarizer.
As a result, the appearance of the obtained polarizing plate will not be stable, and the yield will be poor, so there is a problem of lack of productivity

Method used

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  • Polarizing plate and image display using same
  • Polarizing plate and image display using same

Examples

Experimental program
Comparison scheme
Effect test

reference example 1

[0083] (Reference example 1: Production of polarizer)

[0084] A polyvinyl alcohol film with a thickness of 80μm [manufactured by KURARAY Co., Ltd.] is dyed in a 5% iodine compound aqueous solution [iodine (I) / potassium iodide (KI) weight ratio = 1 / 10], and the dyeing time is adjusted to a polarizer Have a predetermined monomer penetration rate (here 43%), then immerse in 3% boric acid + 2% KI aqueous solution for 10 seconds, and then in 4% boric acid + 3% KI aqueous solution according to the stretching ratio of 5.5 Stretching was carried out in a doubling mode, and finally immersed in a 5% KI aqueous solution for 10 seconds. The obtained stretched film was dried in an oven at 40°C for 3 minutes to obtain a polarizer with a thickness of 30 μm.

reference example 2

[0085] (Reference example 2: Production of protective film with easy adhesion layer)

[0086] One side of the cyclic olefin resin film (manufactured by Japan's ZEON Corporation, trade name: ZEONOR, thickness: 40 μm) was subjected to corona treatment. On the other hand, relative to the chemical formula: NH 2 CH 2 NHCH 2 CH 2 Si(OC 2 H 5 ) 3 100 parts of the indicated silane (manufactured by UNICAR, Japan, trade name: APZ6601) was mixed with 67 parts of isopropanol to prepare a 60% silane solution. A predetermined amount of this silane solution was applied to the corona-treated surface of the cyclic olefin resin film, and dried at 120°C for 2 minutes to obtain a protective film 1 having an easily bonding layer. The thickness of the easy-adhesion layer after drying is 30 nm. In addition, the thickness of the easily bonding layer can be adjusted by changing the coating amount of the silane solution.

reference example 3

[0087] (Reference example 3: Production of protective film with easy adhesion layer)

[0088] Except that the thickness of the easy-adhesive layer after drying was changed to 300 nm, the protective film 2 was prepared in the same manner as in Reference Example 2.

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Abstract

Disclosed is a polarizing plate with excellent appearance which has excellent adhesion between a polarizer and a protective film and exhibits extremely excellent durability under high temperature, high humidity conditions. Also disclosed is an image display using such a polarizing plate. Specifically disclosed is a polarizing plate comprising a polarizer, an adhesive layer, an easily adhesive layer and a protective film composed of a film mainly containing a cyclic olefin resin. The easily adhesive layer contains a silane having a reactive functional group and has a thickness of 1-50 nm. Also specifically disclosed is an image display comprising such a polarizing plate.

Description

Technical field [0001] The present invention relates to a polarizing plate and an image display device using it. In more detail, the present invention relates to a polarizer having excellent adhesion between a polarizer and a protective film, excellent durability under high temperature and high humidity, and excellent appearance, and an image display device using the same. Background technique [0002] The liquid crystal display device, which is a representative image display device, has to arrange polarizing plates on both sides of the liquid crystal cell due to its image forming method. As such a polarizer, a member formed through the following steps is generally used, that is, a polyvinyl alcohol (PVA) film is dyed and stretched with a dichroic substance such as iodine or a dichroic dye to form a polarizer. Furthermore, a protective film such as triacetyl cellulose (TAC) is bonded on both sides of the polarizer using a PVA-based adhesive. [0003] However, because TAC has insu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B5/30G02F1/1335
CPCG02B6/0056G02B1/105Y10T428/1041G02B5/3033C09K2323/031G02B1/14G02B5/30G02F1/1335
Inventor 辻内直树西田昭博和才奏子塘口直树
Owner NITTO DENKO CORP