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Polarized film, optical film, and image display device

一种偏振膜、偏振片的技术，应用在偏振膜领域，能够解决耐久性不充分、干燥效率下降、充分干燥等问题，达到抑制卷曲、耐久性优良、水分率变化低的效果

Active Publication Date: 2014-12-03
NITTO DENKO CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, in the case of using a water-based adhesive, in order to improve the adhesion to the polarizer, a polarizing film with good adhesion cannot be obtained unless the moisture content of the polarizer is relatively increased in advance.
Furthermore, the polarizing film obtained in this way has the following problems: the optical characteristics (polarization characteristics, etc.) cannot be obtained, or the durability against heating and humidification is deteriorated.
However, if a water-based adhesive is used to bond the polarizer to a transparent protective film with low moisture permeability, the drying efficiency will decrease because the transparent protective film with low moisture permeability cannot sufficiently dry water, which is the solvent of the water-based adhesive.
As a result, the polarizing properties of the obtained polarizing film are reduced, or the durability is insufficient, thereby causing appearance problems, and it is impossible to obtain a substantially useful polarizing film.

Method used

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  • Polarized film, optical film, and image display device
  • Polarized film, optical film, and image display device
  • Polarized film, optical film, and image display device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0279]

[0280] After forming a urethane-based easy-adhesive layer with a thickness of 0.5 μm on the above-mentioned acrylic resin film, an MCD coater (manufactured by Fuji Machine Co., Ltd.) (unit shape: honeycomb, number of gravure rolls: 1000 / inch, rotary The above-mentioned active energy ray-curable adhesive was applied on the easy-adhesive layer so that the thickness of the adhesive layer was 0.5 μm at a speed of 140% / relative to the line speed (paraline speed). Next, the acrylic resin film was bonded as transparent protective films 1 and 2 to both surfaces of the above-mentioned polarizing plate with the adhesive agent. Then, the laminated acrylic resin film was heated from both sides to 50° C. using an IR heater, and the above-mentioned ultraviolet rays were irradiated on both surfaces to cure the active energy ray-curable adhesive. Then, it dried with hot air at 70 degreeC for 3 minutes, and obtained the polarizing film which has a transparent protective film on both...

Embodiment 2、3

[0282] In Example 1, except having changed the kind of transparent protective film as shown in Table 2, it carried out similarly to Example 1, and obtained the polarizing film. In addition, when a transparent protective film is a cyclic polyolefin resin film, corona treatment is given to an acrylic resin film instead of forming an easy-adhesive layer.

Embodiment 4

[0284] Before the coating process, a corona discharge of 80 [W·min / m 2 ] except having performed dry processing (corona treatment), it carried out similarly to Example 1, and obtained the polarizing film.

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PUM

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Abstract

A polarized film on which a transparent protective film is provided to both surfaces of a polarizer via an adhesive layer, wherein the adhesive layer is formed by a layer of cured material formed by irradiating an activating energy ray onto an activating energy ray-curable adhesive containing a radical-polymerizable compound, and the transparent protective film has a water-vapor permeability of 150 g / m2 / 24h or less. An activating energy ray-curable adhesive containing radical-polymerizable compounds (A), (B), and (C) with different SP values in a predetermined quantity ratio is preferably used as the activating energy ray-curable adhesive.

Description

technical field [0001] The present invention relates to a polarizing film (polarizing plate) in which a transparent protective film is provided on both surfaces of a polarizing plate through an adhesive formed of an active energy ray-curable adhesive. This polarizing film can form image display devices, such as a liquid crystal display device (LCD), organic electroluminescence display device, CRT, PDP, etc., individually or as an optical film laminated|stacked. Background technique [0002] Liquid crystal display devices are rapidly expanding in markets such as watches, mobile phones, PDAs, notebook computers, monitors for personal computers, DVD players, and TVs. A liquid crystal display device visualizes a polarization state by switching liquid crystals, and uses a polarizing plate based on the display principle. Especially in applications such as TV, high brightness, high contrast, and wide viewing angle are increasingly pursued, and thus high transmittance, high polariz...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B5/30G02F1/1335
CPCC08F2220/283C09J4/00G02B5/30G02B1/105B32B2307/42Y10T428/24942Y10T428/24959B32B37/12B32B2037/1253B32B2551/00G02B5/208G02B5/3033C08F220/283G02B1/18G02B1/14G02F1/1335B32B37/18B32B38/0008B32B38/0036
Inventor 竹田哲郎中田美惠村山俊介山下智弘齐藤武士乾州弘
Owner NITTO DENKO CORP
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