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Polyester film and manufacturing method thereof

A technology of polyester film and manufacturing method, applied in the field of polyester film, can solve the problems of reducing MD shrinkage rate and the like

Inactive Publication Date: 2011-08-03
KOLON IND INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this simple heat treatment has limitations in reducing the shrinkage of MD

Method used

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  • Polyester film and manufacturing method thereof
  • Polyester film and manufacturing method thereof
  • Polyester film and manufacturing method thereof

Examples

Experimental program
Comparison scheme
Effect test

example

[0060] The measured maximum shrinkage stress: 10N (1.02kg=10 / 9.8kg)

[0061] Sample cross-sectional area: 1.5mm 2 (width 15mm, thickness 100μm)

[0062] Maximum shrinkage stress (kg / mm 2 ): 1.02kg / 1.5mm 2 =0.68kg / mm 2

[0063] 3) Tensile Strength / Elongation

[0064] Films were provided with a width of 15 mm, a gauge length of 50 mm, and a cross heating rate of 500 mm / min. The tensile properties of the films in MD and TD were measured using a multifunctional tensile testing machine (Instron, Tensile Test Machine).

[0065] 4) Evaluation of optical properties (haze measurement)

[0066] Haze measurements are based on ASTM D-1003. Seven sections including two edge sections and a center section were arbitrarily extracted from the polyester film. Next, the sections were cut from the sample to a size of 5 cm x 5 cm and inserted into a haze measurement system (Nippon Denshoku NDH 300A). Then, light having a wavelength of 555 nm was injected into the system, after which the ...

example 1

[0070] First, 100 mol% of terephthalic acid, 124 mol% of ethylene glycol as a diol component, and 0.05 mol of antimony trioxide as a catalyst based on an acid component were polycondensed by direct esterification to obtain an intrinsic viscosity of 0.64 dl / g of polyester, followed by polyester having an intrinsic viscosity of 0.64 dl / g was melt extruded at 275°C, followed by rapid cooling to provide a non-oriented sheet.

[0071] The non-oriented sheet is preheated by a set of rollers conveyed on the MD (MDO, Machine Direction Organization, longitudinal mechanism), and then, continuously, is oriented to 2.5 times by an IR heater zone heated to 760°C, Oriented by a factor of 1.3 by an IR heater zone heated to 650°C. Thus, the sheet was oriented in the MD with a total MD orientation of 3.25 times.

[0072] Immediately after MD orientation, the sheet was conveyed to a tenter frame, passed continuously through a preheat zone at 125°C, TD oriented to 3.5 times at 150°C, and then h...

example 2-4

[0075] Except changing the MD orientation degree, IR heater zone temperature, heat treatment temperature, MD relaxation rate, TD relaxation rate, number of relaxation zones, relaxation temperature and MD / TD relaxation gradient in the relaxation zone, the same method as described in Example 1 The method obtains non-oriented sheets and thus obtains different films. The changed conditions are shown in Table 1 in detail. The properties of the films are shown in Table 2.

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Abstract

Provided is a polyester film having excellent high-temperature dimensional stability. More particularly, provided is a method for producing a polyester film, including: a) extruding and cooling a polyester resin to provide a non-oriented sheet; b) orienting the sheet in the machine direction (MD); c) orienting the MD oriented sheet in the transverse direction (TD); d) heat treating the sheet; and e) carrying out simultaneous relaxation by subjecting the heat treated sheet to MD relaxation at a ratio of 1 % or higher, while subjecting it to TD relaxation in a tenter. Provided also is a polyester film obtained by the method.

Description

technical field [0001] The present invention relates to a polyester film, and more particularly, to a polyester film used in a base film for a prism film. Background technique [0002] Biaxially oriented polyester films are used in various industrial fields due to their excellent mechanical properties, thermal properties, electrical properties and chemical resistance. [0003] Specifically, during the preparation process of the optical polyester film, the optical polyester film is usually heat-treated to improve the dimensional stability of the alignment film. However, this heat treatment still has limitations in improving shrinkage in the machine direction (MD). Furthermore, the high temperature during such heat treatment can lead to a reduction in tensile strength / elongation and optical properties. [0004] Typically, this heat treatment reduces the shrinkage stress of the MD. However, this simple heat treatment has a limit to reduce the shrinkage of MD. [0005] There...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J5/18B29C48/00B29C48/08B29C48/91
CPCC08J2367/02C08J5/18B29C48/91B29C48/913B29C48/08B29C48/00B29C48/0019B29C48/022B29C2948/92609B29C2948/92704B29C2948/92761B29C55/14B29C55/143B29C55/20B29D7/01B32B27/36B32B2307/518B32B2307/734B29K2067/003
Inventor 金允照宋起相金时敏
Owner KOLON IND INC
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