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Retardation film

A retardation film and norbornene technology, applied in polarizing elements and other directions, can solve the problems of retardation film retardation compensation range limitation and difficulty in reflecting retardation, etc.

Inactive Publication Date: 2007-10-31
SEKISUI CHEM CO LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, a film composed of a norbornene-based copolymer obtained by copolymerizing a norbornene-based monomer and an α-olefin-based monomer, even under reasonable stretching conditions commonly used or within the range of film thickness Stretching also makes it difficult to exhibit sufficient retardation, and the obtained retardation film has a problem that the range of retardation compensation is significantly restricted.

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0149] (1) Synthesis of norbornene-ethylene copolymer

[0150] In the continuous polymerization device, the concentration of norbornene is 2.95mol / L, the concentration of ethylene is 1.05mol / L, and the ratio of hydrogen to ethylene is 0.21×10 -3 The condition supplies norbornene, hydrocarbon solvent, ethylene and hydrogen. Simultaneously, a catalyst system is supplied to the reaction device, which consists of rac-isopropylidene-bis(tetrahydroindenyl)zirconium dichloride as catalyst, methylaluminoxane (10% toluene solution) as co-catalyst constitute. The temperature of the reaction apparatus was maintained at 90°C. In the subsequent step, the solvent is removed by high temperature and reduced pressure. The melted copolymer was extruded in the form of a strand (strand), which was cut to obtain pellets with a length of 3 mm and a diameter of 2 mm. 0.6% of an antioxidant (trade name Irganox 1010, manufactured by Ciba Specialty Chemicals) and 0.4% of pentaerythritol tetrasteara...

Embodiment 2～4、 comparative example 1

[0154] A norbornene-ethylene copolymer was synthesized in the same manner as in Example 1 except that the synthesis conditions shown in Table 1 were used, and norbornene was obtained in the same manner as in Example 1 except that the obtained norbornene-based copolymer was used. Olefinic copolymer composition and raw film.

[0155] Norbornene concentration

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Abstract

It is excellent in heat resistance and significantly reduced in specific gravity, birefringence, photoelasticity, and wavelength dispersion. It further has the high ability to compensate for retardation. The retardation film comprises a norbornene copolymer composition containing a norbornene copolymer comprising 40-60 mol% repeating units derived from at least one norbornene monomer selected from the group consisting of a monomer represented by the general formula (I), a monomer represented by the general formula (II), a monomer represented by the general formula (III), a monomer represented by the general formula (IV), and a monomer represented by the general formula (V) and 60-40 mol% repeating units derived from an acyclic olefin monomer. When the norbornene copolymer composition is formed into a film and then stretched in a stretch ratio of 2 while being heated at the glass transition temperature determined from dynamic viscoelasticity, then the stretched film has an in-plane birefringence defined by the following equation of 0.0033 or larger.

Description

technical field [0001] The present invention relates to a retardation film made of a norbornene copolymer which is excellent in heat resistance, low specific gravity, low birefringence, low photoelasticity, and low wavelength dispersion, and has high retardation compensation. Background technique [0002] In recent years, liquid crystal display devices (Liquid Crystal Display: LCD) are often used instead of CRT (Cathod Ray Tube) of cathode ray tube type in display devices such as computers and flat televisions. Generally speaking, such a liquid crystal display device has a structure in which a retardation film is bonded to a glass cell with electrodes in which liquid crystal molecules are sealed via a transparent adhesive, and a retardation film is bonded to the glass cell via an adhesive. polarizer. [0003] The retardation film used in such a liquid crystal display device is generally made of polycarbonate resin, cellulose resin, polyvinyl chloride resin, acrylonitrile re...

Claims

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Application Information

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IPC IPC(8): G02B5/30C08F232/08C08F210/00C08L45/00
Inventor 平池宏至泽田贵彦八木一成樋口勋夫丰岛克典森田健晴野里省二高榎义宏中村岳博维尔弗里德·哈特克马蒂亚斯·布鲁赫安妮－迈克·绍尔维恩诺尔德乌多·曼弗雷德·施特林金井裕之芹泽肇
Owner SEKISUI CHEM CO LTD
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