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Optical film and method of manufacturing the same

An optical film and retardation film technology, applied in the field of optical film and the preparation of the optical film, can solve the problems of reduced heat resistance, increased thermal expansion coefficient, reduced glass transition temperature of the overall film, etc., and achieves the effect of excellent toughness

Active Publication Date: 2010-08-11
LG CHEM LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when an impact cushioning material is added to the film, the toughness can be improved, but the problem is that the heat resistance is significantly reduced, resulting in a rapid increase in the coefficient of thermal expansion and a decrease in the glass transition temperature of the overall film

Method used

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  • Optical film and method of manufacturing the same
  • Optical film and method of manufacturing the same
  • Optical film and method of manufacturing the same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0066] Using a unidirectional twin-screw extruder, the resin composition is dry-blended to prepare heat-resistant mixed pellets, wherein the resin composition includes 80wt% matrix resin and 20wt% impact buffer material, SM-MMA- The ratio of MAH (styrene-methyl methacrylate-maleic anhydride) is 23:70:7wt%, and the weight-average molecular weight is 130,000; the shell molecular weight of the impact buffer material is 130,000 except rubber, and the core and shell The grafting rate was 40%. After the prepared pellets were dried, an extruded film having a thickness of 80 μm was prepared using an extruder including a T-die. Physical properties of the prepared films were measured, and the results are shown in Table 1 below.

Embodiment 2

[0068] Except using the resin composition comprising 80wt% matrix resin and 20wt% impact buffer material, wherein the ratio of SM-MMA-MAH (styrene-methyl methacrylate-maleic anhydride) in the matrix resin is 23: 70:7wt%, and the weight-average molecular weight is 130000; The shell molecular weight of this impact buffer material is 130000 except rubber, and the graft rate of core and shell is 50%, uses the same method as embodiment 1 to measure the physics of film. properties, and the results are shown in Table 1 below.

Embodiment 3

[0070] Except using the resin composition comprising 80wt% matrix resin and 20wt% impact buffer material, wherein the ratio of SM-MMA-MAH (styrene-methyl methacrylate-maleic anhydride) in the matrix resin is 23: 70:7wt%, and the weight-average molecular weight is 130000; The shell molecular weight of this impact buffer material except rubber is 160000, and the graft ratio of core and shell is 45%, uses the same method as embodiment 1 to measure the physics of film. properties, and the results are shown in Table 1 below.

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Abstract

The present invention provides an optical film that includes i) an acryl resin, and ii) 20 to 65 parts by weight of a core-shell type graft copolymer that includes a core having a rubber component and a shell including a polymer having a weight average molecular weight that is the same as or higher than a weight average molecular weight of a polymer constituting the i) acryl resin based on 100 parts by weight of the acryl resin, a retardation film, and an electronic device including the same.

Description

technical field [0001] The present invention relates to an optical film and a method for preparing the optical film. More specifically, the present invention relates to an optical film having excellent toughness so that the film is not damaged even if it is folded by hand, and which has no increase in coefficient of thermal expansion caused by additives, and a method for producing the same, and has an overall The glass transition temperature (Tg) of the resin did not decrease or decreased very little. The optical film can be effectively applied to electronic devices such as display devices including LCDs. This application claims priority from Korean Patent Application No. 10-2007-0096477 filed with the Korean Intellectual Property Office on September 21, 2007, the entire disclosure of which is incorporated herein by reference. Background technique [0002] In recent years, with the advancement of optical technology, various types of display technologies have been proposed,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J5/18
CPCC08J2333/12C08J5/18B29C55/005B29C55/02C08J2333/08C08J2451/04C08J2479/08C08L2205/02C08L2207/53G02B1/04G02B5/30
Inventor 姜秉逸韩昌薰李大雨徐在范柳贞娥吴松泽
Owner LG CHEM LTD