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Retardation film

A retardation film and retardation technology, applied in optics, instruments, nonlinear optics, etc., can solve problems such as the influence of the mechanical properties or melting properties of copolymers, and the lack of research on optical properties.

Inactive Publication Date: 2007-08-22
TEIJIN LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, it has been reported that this difference affects the mechanical properties or melting properties of the copolymer (see JP-8-507800, JP-8-507801, and JP-7-2953). The difference in the properties of optics has not been studied so far

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0106] A stainless steel autoclave having a capacity of 500 mL having stirring blades was used as a polymerization apparatus, and ethylene-bis(1-indenyl)zirconium dichloride was used as a metallocene, and copolymerization reaction of ethylene and norbornene was carried out as follows.

[0107] After replacing the inside of the autoclave with nitrogen, 100 mL of toluene and 32 g of norbornene were added to the container, and then 0.1 mmol of triisobutylaluminum was added as a scavenger. Then, 30 mg of ethylene-bis(1-indenyl)zirconium dichloride was previously dissolved in 35 mL of a PMAO toluene solution with a concentration of 2 M under a nitrogen atmosphere, and stirred at 25° C. for 10 minutes to activate it. Metallocene-PMAO solution. Next, after raising the temperature to 40° C., 9.5 g of ethylene was charged into the container by pressurizing to initiate polymerization. After initiating the polymerization for 2 hours, return to the nitrogen atmosphere, and add a small am...

Embodiment 2

[0111] TOPAS (trade name) manufactured by TICONA is a cycloolefin copolymer obtained by copolymerizing ethylene and norbornene with a metallocene catalyst. Carry out its grade 6013 (Tg = 140 ° C) 13 C-NMR determination. Its spectrum is shown in Figure 2. From Fig. 2, meso-type dyads / racemic-type dyads=0.36 / 0.04=9, and the ratio (mole fraction) of NN dyads to the total norbornene content is 0.40 . In addition, the molar ratio (A) / (B) of the ethylene component and the norbornene component=50 / 50. Regarding the molecular weight, the reduced viscosity ηsp / c was 0.80 dL / g. Using a twin-screw melt extruder (Nippon Steel Works Co., Ltd. TEX30SS-42BW-3V), the pellets were melt-extruded from a T-die with a width of 15 cm, and continuously wound with a cooling roll to form a film. Under the film forming conditions of cylinder temperature of 260°C, T die temperature of 270°C, cooling roll temperature of 145°C, and film forming speed of 1m / min, the film has excellent transparency and ...

Embodiment 3、4

[0114] Using the unstretched film of Example 2, longitudinal uniaxial stretching was carried out under other stretching conditions shown in Table 1. The results are shown in Table 1.

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Abstract

A retardation film that has high moisture resistance and excels in dimensional stability and that can be assembled in, for example, a liquid crystal display apparatus to thereby attain effective utilization for enhancements of visual field angle, contrast, color compensation and other liquid crystal display quality. There is provided a retardation film comprised of an amorphous polyolefin copolymer (a) composed of ethylene units and norbornene units, (b) wherein the norbornene units each contain a 2-chain site, the stereoregularity of the 2-chain site being meso type or racemo type, the ratio of meso type 2-chain site / racemo type 2-chain site being 4 or higher, and (c) having a glass transition temperature ranging from 100 to 180 DEG C.

Description

technical field [0001] The present invention relates to retardation films. More specifically, it relates to a retardation film using an amorphous polyolefin copolymer containing an ethylene unit and a norbornene unit. Background technique [0002] In recent years, liquid crystal display devices have been greatly improved, and not only small and medium-sized liquid crystal display devices such as mobile phones and personal computer monitors, but also large liquid crystal display devices for televisions are widely used. For liquid crystal display devices, in order to improve the display quality such as color compensation of liquid crystals, expansion of viewing angle, and improvement of contrast, retardation films exhibiting birefringence are usually used in polymer films. polycarbonate etc. For the retardation film, resins called amorphous polyolefins have recently attracted attention. The amorphous polyolefin refers to a polyolefin having an alicyclic structure that impro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B5/30G02F1/13363
CPCG02B5/3083Y10T428/10C09K2323/00C08J5/18G02B5/30G02F1/13363
Inventor 新田英昭松田裕生松村俊一
Owner TEIJIN LTD