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Optical film, polarizer protective film, polarizing plate and image display device

An optical film, methyl technology, applied in the field of optical film, can solve problems such as retardation

Inactive Publication Date: 2011-11-09
NIPPON SHOKUBAI CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The optical film of Patent Document 2 is not a polarizer protective film, and it exhibits a large in-plane phase difference of 400 nm maximum

Method used

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0091] The present invention is further described in detail below by way of examples. The present invention is not limited to the following examples.

[0092] First, the evaluation methods of the polymer and the optical film produced in this example are shown.

[0093] [Glass transition temperature (Tg)]

[0094] The Tg of the polymer was determined by the starting point method based on the regulation of JIS K7121. Specifically, using a differential scanning calorimeter (manufactured by Rigaku, DSC-8230), under a nitrogen atmosphere, about 10 mg of a sample was heated from normal temperature to 200° C. (the temperature increase rate was 20° C. / min), and the obtained DSC curve Make an evaluation. The reference uses alpha-alumina.

[0095] [Weight average molecular weight]

[0096] The weight-average molecular weight of the polymer was obtained in terms of polystyrene by gel permeation chromatography (GPC). The apparatus and measurement conditions used for the measurement ...

manufacture example 1

[0120] Add 45 parts by mass of methyl methacrylate (MMA) and 5 parts by mass of N-cyclohexylmaleimide (CHMI) into a reaction kettle equipped with a stirring device, a temperature sensor, a cooling pipe, and a nitrogen gas introduction pipe and as a polymerization 50 parts by mass of toluene as a solvent was heated up to 105° C. while blowing nitrogen there. As the temperature rises, reflux starts, and while adding 0.04 parts by mass of tert-amyl peroxyisononanoate (manufactured by Atfina Gifu, trade name: Luperox 570) as a polymerization initiator, the above-mentioned isononanoic acid peroxide is added dropwise over 4 hours. 0.16 parts by mass of t-amyl ester was solution-polymerized under reflux at about 105 to 110° C., and aging was further performed for 4 hours. Next, the obtained polymer solution was dried under reduced pressure at 200° C. for 1 hour to obtain a transparent solid of a (meth)acrylic polymer (A-1) having a CHMI unit and an MMA unit as structural units. The ...

manufacture example 2

[0122] The feeding amount of MMA and CHMI is set to 40 mass parts and 10 mass parts respectively, the time of aging is set to 5 hours, and the drying temperature of the obtained polymerization solution is set to 220 ℃, in addition, with In Example 1, a transparent solid of a (meth)acrylic polymer (A-2) having CHMI units and MMA units as structural units was obtained in the same manner. The polymer (A-2) had a weight average molecular weight of 220,000 and a Tg of 128°C. The evaluation result of the foamability test of the polymer (A-2) was "⊚ (excellent)". The CHMI unit content in the polymer (A-2) was 20% by mass, and the MMA unit content was 80% by mass.

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PUM

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Abstract

The invention provides an optical film, a polarizer protective film, a polarizing plate and an image display device. The optical film in the invention comprises a (methyl) acrylic acid polymer (c) with an N- substitute maleimide unit (a) and a (methyl) acrylic acid ester unit (b) as the structural unit. The N- substitute maleimide unit (a) is a structural unit applying effect of positive fixing double refraction upon the (methyl) acrylic acid polymer (c). The (methyl) acrylic acid ester unit (b) is a structural unit applying effect of negative fixing double refraction upon the (methyl) acrylic acid polymer (c). The optical film in the invention displays an inplane phase difference Re in the range of 0nm to 10nm, and a thickness direction phase Rth in the range of -10nm to 10nm with respective to light with wavelength of 589nm. The optical film in the invention is a bidirectional stretching film. Although the optical film is a bidirectional stretching film, the displayed phase direction is small and high heat resistance is provided.

Description

technical field [0001] The present invention relates to an optical film having a low phase difference as a biaxially stretched film. Furthermore, the present invention relates to a polarizer protective film, a polarizing plate, and an image display device. Background technique [0002] In recent years, the market for flat-panel image display devices such as liquid crystal display devices (LCDs) is expanding. In image display devices, optical films are used. An optical film requires not only transparency but also closely adjusted optical characteristics in accordance with the optical design of an image display device. One of the optical properties is phase difference. For example, for a polarizer protective film used in a polarizing plate of an LCD, a phase difference close to zero is required. A polymer material used in an optical film generally exhibits birefringence based on a difference in refractive index between a direction along a polymer main chain and a direction...

Claims

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Application Information

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IPC IPC(8): G02B5/30G02B1/10G02F1/1335G02F1/13363C08L33/04C08L33/12
CPCC08L33/04C08L33/12G02B1/14G02B5/3083G02F1/13363
Inventor 伊藤正自中昭夫
Owner NIPPON SHOKUBAI CO LTD
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