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Optical film and tis producing method and polaroid lens

A manufacturing method and optical film technology, applied in the field of polarized lenses, can solve the problems of increased birefringence and optical axis deviation, light leakage, and difficulty in preventing light leakage, etc.

Inactive Publication Date: 2003-04-09
SEKISUI CHEM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0017] But, the polarizing lens of the TAC film that is made with this casting process uses TAC film as polarizer protection film, because TAC film has large photoelastic coefficient, it can appear following problem aspect polarization characteristic: In crossed Nicol prism Increased birefringence and optical axis deviation and light leakage in configurations
But there is a disadvantage that it is difficult to prevent light leakage when viewing polarized lenses from a certain angle

Method used

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  • Optical film and tis producing method and polaroid lens
  • Optical film and tis producing method and polaroid lens
  • Optical film and tis producing method and polaroid lens

Examples

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example 1 to 9 and comparative example 1 and 2

[0123] Retardation and optical axis deviation are given below as values ​​measured with an automatic birefringence analyzer "ROBRA-21ADH" (manufactured by Oji Scientific Instruments) with a ray wavelength of 590 nm. Specifically, cut off the ends opposite to the width of the film that respectively extend the total width of the film by 10%, and measure the retardation of all test points arranged at intervals of 50mm in the width direction of the film, and test the retardation of all test points arranged at intervals of 1m in the direction of flow. The delay of the test point, and calculate the arithmetic mean value of the test value, thus get the delay value. The optical axis deviation is indicated by the angle with the largest absolute value among the angles between the orientation angle of the film and its flow direction.

[0124] (1) Resins used include: manufactured by IECN Corporation, product name "IEDNDR1600", Tg = 168 ° C saturated norbornene resin and Teijin-Amoco Eng ...

example 1

[0130] The saturated norbornene resin was extruded under the condition that the mold temperature was 220° C. and the air gap was 80 mm. The temperature of the film immediately before contacting the chill roll measured with a radiation thermometer was 310°C. The average value of the remaining retardation of the produced film was 9.50 nm, and the deviation of the optical axis was 7°.

example 2

[0132] The saturated norbornene resin was extruded under the condition that the mold temperature was 310° C. and the air gap was 70 mm. The temperature of the film just before it came into contact with the chill roll was 250°C. The average value of the remaining retardation of the produced film was 2.75 nm, and the deviation of the optical axis was 7°.

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Abstract

An optical film made via melt extrusion of a noncrystalline thermoplastic resin and having a thickness of below 100 mum, a residual phase difference of up to 10 nm and an optical axis deviation within +-10 DEG , and a method for manufacture of an optical film wherein, when a nocrystalline thermoplastic resin having a glass transition temperature Tg is extruded from an extrusion die into a film and bringing the film into close contact with a chill roll, a temperature of the film before the film from the die exit is brought into close contact with the chill roll is maintained not to fall below Tg+50 DEG C.

Description

technical field [0001] The present invention relates to the light film that can be used in optics, display and other purposes and its manufacture method and polarized lens, more particularly relate to the light film with low light strain that melt extrusion (melt extrusion) is made and its manufacture method and use The light film is polarized lenses. Background technique [0002] In recent years there has been an increasing demand for optical films with high transparency and low residual retardation in the optical field and in displays. However, when such an optical film is produced by the melt extrusion method, strain due to stress is generated in the film due to film deformation during film formation, and remains in the film as optical strain. [0003] This optical strain remains in the film as a phase difference. As a result, the use of such films as optical disk substrates and liquid crystal displays has caused serious problems. [0004] as a way to reduce light stra...

Claims

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Application Information

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IPC IPC(8): C08J5/18B29C48/08
CPCB29C47/8865B29K2995/0018B29C47/0021B29C47/8845B29C48/08B29C48/914B29C48/916C08J5/18
Inventor 泽田贵彦荻野健太郎西村克已冈田安正田畑博则野里省二小林仁
Owner SEKISUI CHEM CO LTD
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