Optical film, polarizing plate and image display device

An optical film and polarizing plate technology, applied in optics, optical components, polarizing components, etc., can solve problems such as phase difference and reduced polarizing plate function, and achieve the effects of improved durability, increased polarization, and high visible light transmittance

Inactive Publication Date: 2010-09-08
DAI NIPPON PRINTING CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] However, uniaxially stretched polyethylene or polypropylene has a problem of causing retardation and degrading its function as a polarizing plate.

Method used

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  • Optical film, polarizing plate and image display device
  • Optical film, polarizing plate and image display device
  • Optical film, polarizing plate and image display device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0202] Benzene was added to a polypropylene resin synthesized by a metallocene catalyst (“WINTEC (trade name)”, manufactured by Nippon Polypropylene Co., Ltd., flexural modulus: 900 MPa, melting point 142° C., hereinafter referred to as “mPP-A”). Triazole phenol (2-(2H-benzotriazol-2-yl)-4,6-bis(1-methyl-1-phenylmethyl)phenol, "TINUVIN234 (trade name)": steam Pakistani Co., Ltd.) was used as an ultraviolet absorber to prepare a polypropylene-based resin mixture. Here, content of the benzotriazole phenol compound was set to 1.0 mass % with respect to a polypropylene resin mixture. This polypropylene-based resin mixture was subjected to T-die extrusion molding with a thickness of 100 μm under the conditions of a processing temperature of 200° C. and a take-up roll temperature of 50° C. to obtain an optical film. This optical film was evaluated by the above-mentioned evaluation method. The results are shown in Table 1 and Table 2.

Embodiment 2

[0204] In Example 1, except having set content of a benzotriazole-type phenol to 0.5 mass % with respect to a polypropylene resin mixture, it carried out similarly to Example 1, and obtained the optical film. Table 1 and Table 2 show the results of evaluation carried out in the same manner as in Example 1.

Embodiment 3

[0206] In Example 1, except having set content of a benzotriazole-type phenol to 5 mass % with respect to a polypropylene resin mixture, it carried out similarly to Example 1, and obtained the optical film. Table 1 and Table 2 show the results of evaluation carried out in the same manner as in Example 1.

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Abstract

Disclosed is an optical film having excellent optical characteristics such as low haze value, excellent transparency, high visible light transmittance and low birefringence, which is further excellent in water vapor permeability and ultraviolet absorption. Also disclosed are a polarizing plate using such an optical film, and an image display device using such a polarizing plate. Specifically disclosed is an optical film for polarizer protective films, which is composed of a polypropylene resin mixture mainly containing a polypropylene resin synthesized by a metallocene catalyst and also containing a benzotriazole compound. The benzotriazole compound is contained in an amount of 0.08-5.5% by mass relative to the polypropylene resin mixture. Also specifically disclosed is a polarizing plate obtained by forming such an optical film on at least one side of a polarizer. Further specifically disclosed is an image display device using such a polarizing plate.

Description

technical field [0001] The present invention relates to an optical film for a protective film of a polarizing plate, a polarizing plate using the film as a protective film on one or both sides of a polarizing plate, and an image display device using the polarizing plate. The film has low turbidity and excellent transparency; excellent optical properties such as high visible light transmittance and small birefringence; good mechanical strength, heat resistance and moisture permeability; and excellent ultraviolet absorption performance. Background technique [0002] A polarizing plate is a material having a function of transmitting only light having a specific vibration direction and shielding other light, and is widely used, for example, as one of components constituting a liquid crystal display device. As such a polarizing plate, a polarizing plate having a structure in which a polarizing plate and a protective film are laminated is generally used. The polarizer is a materi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B5/30C08K5/3475C08L23/10G02F1/1335
CPCC08L23/14C08K5/3475C08J5/18G02F2201/50G02F1/133528G02F2201/086G02F2202/022G02B5/305C08J2323/12C08L23/10C08L2314/06C08L2205/02C09K2323/031C08L2666/04C08L2666/06
Inventor 渡边和昭四十宫隆俊
Owner DAI NIPPON PRINTING CO LTD
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