POLYESTER FILM FOR PACKAGING, AND PACKAGING MATERIAL USING IT

• Main Authors: MATSUI RYOSUKE, HASHIMOTO KOKICHI, TANAKA HIROYUKI
• Format: Patent
• Language: English
• Published: 22.01.2004
• Edition: 7
• Subjects: AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F,C08G; CHEMICAL SURFACE TREATMENT; CHEMISTRY; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATIONOR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY IONIMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; COATING MATERIAL WITH METALLIC MATERIAL; COATING METALLIC MATERIAL; COMPOSITIONS BASED THEREON; COMPOSITIONS OF MACROMOLECULAR COMPOUNDS; DIFFUSION TREATMENT OF METALLIC MATERIAL; GENERAL PROCESSES OF COMPOUNDING; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION INGENERAL; LAYERED PRODUCTS; LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT ORNON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM; METALLURGY; ORGANIC MACROMOLECULAR COMPOUNDS; PERFORMING OPERATIONS; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THESURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; THEIR PREPARATION OR CHEMICAL WORKING-UP; TRANSPORTING; WORKING-UP

PROBLEM TO BE SOLVED: To provide a polyester film for packaging which, while maintaining the characteristics of a polyester film, i.e. low moisture absorption properties, dimensional stability, flatness, and transparency, has the characteristics of a biaxially oriented polyamide film, i.e. impact resistance and flexural pinhole resistance, and, in addition, excellent gas barrier properties; and a packaging material using the polyester film. SOLUTION: The polyester film for packaging is made of a polyester resin containing 0.1-5 wt% low-Tg polymer having a glass transition temperature of -100 to 20°C. The major axis of dispersed particles of the low-Tg polymer in the film is 0.3-1.0 μm, and the minor axis is 1-50 nm. COPYRIGHT: (C)2004,JPO