Optical film and information technology apparatus comprising the same

a technology of information technology and optical film, applied in the field of optical film, can solve problems such as light leakage, and achieve the effects of excellent optical property and optical transparency, low haze, and not easily broken

Inactive Publication Date: 2010-12-09
LG CHEM LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0009]The present invention relates to an optical film having excellent optical property and optical transparency, and low haze, that is not easily broken unlike an acryl-based film that is easily broken while stretching processes are carried out, and has excellent mechanical strength and processability, and durability such as heat resistance, and in particular, has a low absolute value of in-plane retardation and thickness retardation and a low absolute value of photoelasticity coefficient regardless of the stretching, and a polarizing plate and an information technology apparatus including the same.
[0018]An optical film according to the present invention has excellent optical property and optical transparency, and low haze, is not easily broken unlike an acryl-based film that is easily broken while stretching processes are carried out, and has excellent mechanical strength and processability, and heat resistance, and has a low absolute value of in-plane retardation and thickness retardation and a low absolute value of photoelasticity coefficient regardless of the stretching. Accordingly, the optical film may be useful for the case of when the retardation and the photoelasticity coefficient are low like a protective film of a polarizer.

Problems solved by technology

For example, in the case of the liquid crystal display, according to the development toward the thin film, the lightness, and enlargement of the picture area, the wide viewing angle, the high contrast, the suppression of change in picture color tone according to the viewing angle and the uniformity of the picture display are particularly considered as important problems.
In addition, light does not pass through the front sides of two polarizing plates that are vertical to each other, but if the angle is inclined, the light axes of two polarizing plates are not vertical to each other, thus light leakage occurs.

Method used

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  • Optical film and information technology apparatus comprising the same
  • Optical film and information technology apparatus comprising the same
  • Optical film and information technology apparatus comprising the same

Examples

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example 1

[0083]The resin composition in which poly(N-cyclohexylmaleimide-co-methylmethacrylate), the styrene-maleic anhydride resin and the phenoxy-based resin were uniformly mixed with each other at a weight ratio of 100:2.5:5 was provided to a 24φ extruder in which nitrogen was substituted from the raw material hopper to the extruder, and melted at 250° C. to manufacture the raw material pellet.

[0084]As the phenoxy-based resin, PKFE (Mw=60,000, Mn=16,000, and Tg=95° C.) manufactured by InChemRez®, Co., Ltd. was used, and Dylarck 332 that included 85 wt % of styrene and 15 wt % of maleic anhydride was used as the styrene-maleic anhydride copolymer resin. In the poly(N-cyclohexylmaleimide-co-methylmethacrylate) resin, the content of N-cyclohexylmaleimide was 6.5 wt % which was analyzed by using the NMR.

[0085]The obtained raw material pellets were dried in the vacuum, melted at 260° C. by using the extruder, and passed through the coat hanger type of T-die, the chrome-coated casting roll and ...

example 2

[0086]The resin composition in which poly(N-cyclohexylmaleimide-co-methylmethacrylate), the styrene-maleic anhydride resin and the phenoxy-based resin were uniformly mixed with each other at a weight ratio of 100:2.5:5 was provided to a 24φ extruder in which nitrogen was substituted from the raw material hopper to the extruder, and melted at 250° C. to manufacture the raw material pellet.

[0087]The obtained raw material pellets were dried in the vacuum, melted at 260° C. by using the extruder, and passed through the coat hanger type of T-die, the chrome-coated casting roll and the dry roll to manufacture the film that had the thickness of 150 μm. This film was stretched by using the pilot stretching device at 125 to 140° C. in the MD direction using a difference between speeds of rolls at the ratio of 170% described in the following Table 2, and stretched in the TD direction at 125 to 140° C. by using the tenter at the ratio of 250% described in the following Table 2 to manufacture t...

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Abstract

The present invention relates to an optical film comprising an aromatic based unit having chain having the hydroxy group containing portion and aromatic moiety; and a styrene-based unit comprising one or more styrene-based derivatives, and has absolute values of in-plane retardation (Rin) and thickness retardation (Rth) of 10 nm or less regardless of stretching, and a polarizing plate and an information technology apparatus including the same.

Description

CROSS REFERENCE TO RELATED APPLICATIONS[0001]The present application is a continuation of application Ser. No. 12 / 387,553, filed May 4, 2009, which is a continuation of International Application No. PCT / KR2009 / 002303, filed Apr. 30, 2009, which claims the benefit of Korean Patent Application No. 10-2008-0040843, filed Apr. 30, 2008 and 10-2009-00020070, filed Jan. 9, 2009. The disclosures of said applications are incorporated by reference herein.TECHNICAL FIELD[0002]The present invention relates to an optical film having excellent heat resistance and optical transparency, low haze, and excellent optical property, is not easily broken, and has excellent mechanical strength and durability, and a polarizing plate and an information technology apparatus including the same.BACKGROUND OF THE INVENTION[0003]Recently, display technologies using various methods such as a plasma display panel (PDP), a liquid crystal display (LCD) and the like that are used instead of a known braun tube in acc...

Claims

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Application Information

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Patent Type & AuthorityApplications(United States)
IPC IPC(8): C08L39/04
CPCG02B5/3083C09D125/14Y10T428/1041Y10T428/105C08L25/14C09K2323/031C09K2323/035C08F212/08C08F220/06C08J5/18G02B5/30
InventorUM, JUN-GEUNLEE, MIN-HEELEE, NAM-JEONGLEE, JONG-HUNKIM, DONG-RYULCHO, SAE-HAN
OwnerLG CHEM LTD