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Stretched optical film and image display device using the same

A stretched film and optical technology, which is applied in the field of stretched films for optics and image display devices using the stretched films for optics, can solve the problems of optical defects, inability to form polymers into films, and reduced formability, etc. The effect of excellent image display characteristics

Active Publication Date: 2015-06-03
NIPPON SHOKUBAI CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When a gel is generated, the gel has optical defects, making it difficult to use as a stretched film for optics
In addition, when the formability is reduced, it may not be possible to form the polymer into a film

Method used

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  • Stretched optical film and image display device using the same
  • Stretched optical film and image display device using the same
  • Stretched optical film and image display device using the same

Examples

Experimental program
Comparison scheme
Effect test

manufacture example 1

[0394] In the reaction device equipped with stirring device, temperature sensor, cooling pipe and nitrogen inlet pipe, drop into 10 parts by weight of N-phenyl itaconimide (N-PII), 90 parts by weight of methyl methacrylate (MMA), 0.01 parts by weight of n-dodecyl mercaptan as a polymerization chain transfer agent and 100 parts by weight of methyl isobutyl ketone as a polymerization solvent were heated up to 80° C. while blowing nitrogen gas thereinto. When the reflux started with the temperature rise, 0.2 parts by weight of 2,2'-azobis(2-methylisobutyronitrile) was added as a polymerization initiator, and the reflux was carried out at about 80 to 85°C for 7 hours. solution polymerization.

[0395] Next, the polymerization solution thus obtained was dried at 240° C. for 1 hour under reduced pressure to obtain a transparent polymer (A-1) composed of N-PII units and MMA units.

[0396] The polymer (A-1) had a Tg of 128°C, a weight average molecular weight of 110,000, and a 5% th...

manufacture example 2

[0398] Except not using N-PII but using 10 parts by weight of N-cyclohexyl itaconimide (N-CHII), obtain the transparent polymer (A -2).

[0399] The polymer (A-2) had a Tg of 127°C, a weight average molecular weight of 100,000, and a 5% thermal weight loss temperature of 297°C.

manufacture example 3

[0401] Except not using N-PII but using 10 parts by weight of N-butyl itaconimide (N-BII), obtain the transparent polymer (A -3).

[0402] The polymer (A-3) had a Tg of 108°C, a weight average molecular weight of 100,000, and a 5% thermal weight loss temperature of 293°C.

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Abstract

Provided is a stretched optical film obtained by stretching a resin having a negative intrinsic birefringence which has various excellent characteristics such as being capable of achieving a large negative phase difference in the thickness direction, having a high heat resistance and a high flexibility, being highly resistant against thermal decomposition and suffering from little optical defects such as gelation.  A stretched optical film obtained by stretching a resin having a negative intrinsic birefringence, which contains a polymer comprising, as the constituting unit thereof, e.g., itaconimide or an itaconimide derivative, can achieve a large negative phase difference in the thickness direction and has a high heat resistance.

Description

[0001] This application is a divisional application. The international application number of the original application is PCT / JP2009 / 058773, the Chinese national application number is 200980116911.8, and the application date is May 11, 2009. Polarizing plate and image display device of stretched film for optics". 【Technical field】 [0002] The present invention relates to an optical stretched film obtained by stretching a resin having negative intrinsic birefringence, typically a negative retardation film, and a polarizing plate and an image display device using the film. 【Background technique】 [0003] A stretched film obtained by uniaxially stretching or biaxially stretching a resin film is widely used in the field of image display. As one of the modes, there is a retardation film utilizing birefringence based on polymer orientation by stretching. Retardation films are widely used for color tone compensation and viewing angle compensation in liquid crystal display devices ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02B5/30G02F1/13363C08L33/00C08L25/12C08L51/04
CPCG02B5/3033G02F1/13363G02F2202/40
Inventor 中西秀高清水郁雄
Owner NIPPON SHOKUBAI CO LTD
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