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Polyester film

A polyester film and film technology, applied in the field of polyester film, can solve the problems of poor air resistance stability, decreased thermal shrinkage, lack of adhesion, etc., and achieve the effect of excellent performance

Active Publication Date: 2006-09-20
TOYOBO CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These films are thermally fixed after biaxial stretching to reduce the heat shrinkage rate, and it is hoped to prevent problems during post-processing, but due to polyethylene terephthalate-based resins and polyethylene terephthalic acid The difference in melting point of butanediol ester resins is about 30°C, and thermal shrinkage cannot be sufficiently suppressed, so there are many restrictions on post-processing.
[0005] In addition, there are problems that, since these films are not provided with an easy-adhesive coating layer, the easy-adhesiveness of the ink is not good, and the adhesion is lacking when a vapor-deposited layer made of a metal or an inorganic oxide is provided, so The stability of gas barrier property after boiling treatment is deteriorated
In addition, if the conditions for forming the easy-adhesive coating layer are not optimized, problems such as whitening may occur

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0136] A polyethylene terephthalate-based resin (A1) (relative viscosity 0.75) to which 2000 ppm of silica (F) (manufactured by FUJI SILYSIA: Silysia 310) was previously added during polymerization was prepared as resin A, and polyethylene terephthalate resin (A1) was prepared as resin A. Butylene phthalate-based resin B1 (relative viscosity: 1.20), and polybutylene terephthalate-based resin to which 1% of an organophosphorus compound (manufactured by Soden Chemical Industry Co., Ltd.: Adeka Stub PEP-45) was added (B2) (relative viscosity: 1.10) As resin B, terephthalic acid / sebacic acid / / ethylene glycol with 2% talc (D) (average particle size measured by electron microscopy: 3.5 μm) was added in advance during polymerization. Resin C was a polyester polymer (C1) of alcohol / 1,4-butanediol (90 / 10 / / 60 / 40 (molar ratio) molecular weight: 2000). These were mixed at A1 / B1 / B2 / C1=40 / 56 / 2 / 2 (parts by weight), and charged into a single-screw extruder (propeller 65φ: UB manufactured by M...

Embodiment 2

[0141] In the same manner as in Example 1, a polyester film and a film with a vapor-deposited layer were obtained in the same manner as in Example 1, except that after heat-fixing in the transverse direction, a roll with a peripheral speed difference was used to relax in the longitudinal direction at a relaxation rate of 2%. Polyester film. The properties of the obtained film were evaluated, and the results are shown in Tables 1 and 2.

Embodiment 3

[0143] In the same manner as in Example 1, a polyester film and a film on which a vapor-deposited layer was formed were obtained in the same manner as in Example 1, except that after heat-fixing in the transverse direction, a roll with a peripheral speed difference was used to relax in the longitudinal direction at a relaxation rate of 4%. Polyester film. The properties of the obtained film were evaluated, and the results are shown in Tables 1 and 2.

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PUM

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Abstract

Provided is a polyester film which is excellent in heat resistance, chemical resistance, insulating characteristics, dimensional stability at elevated temperatures, and is suitable for use in a variety of fields of application such as those needing a boiling or retort treatment which requires satisfactory levels in toughness, the resistance to pin-holing, the resistance to flexing, the resistance to the breakage of a bag by dropping, impact resistance and the like, those practicing thermal molding or vacuum molding, those of bags for packaging foods containing water or drugs. A polyester film, characterized in that it exhibits an initial modulus of elasticity at least in one direction of 2.5 to 10 GPa, an impact strength of 40 to 10000J / mm, a thermal shrinkage at 150 DEG C at least in one direction of -0.5 to 6 %, a haze of 0.001 to 7 %, and an absolute value of the difference between the thermal shrinkage percentages in the longitudinal direction and in the transverse direction of 1.1 % or less.

Description

technical field [0001] The present invention relates to a polyester film which is suitable for various food packaging, general industrial, optical, electrical materials, forming processing, film-laminated metal plate constituent materials, etc. Excellent performance. Background technique [0002] Films made of polyester represented by polyethylene terephthalate resins are used in various applications due to their mechanical properties and heat resistance. However, it was also found that it is not suitable for some applications due to its poor flexibility and formability. On the other hand, films made of polyamide represented by 6-nylon are often used as food packaging materials and the like because of their excellent flexibility, pinhole resistance, and air barrier properties. However, because of lack of dimensional stability due to moisture absorption, it is difficult to use for food packaging applications or industrial applications requiring boiling or retort processing....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J5/18C08J7/04B65D65/02C08L67/02C08J7/043C08J7/048C23C28/00
CPCY10T428/31681C08J7/047Y10T428/31786Y10T428/28B65D65/02C08J5/18C08J7/08C08J2367/02Y10T428/24802C08L67/02Y10T428/31794C08J7/048C08J7/043C08J7/123C08L2666/18C08L67/03B29C55/02C08J7/0427
Inventor 伊藤胜也向山幸伸
Owner TOYOBO CO LTD
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