EASY-TEAR POLYESTER FILM

PROBLEM TO BE SOLVED: To prepare a polyester film with an excellent straight tearing property, and a packaging bag made therefrom, having an excellent tear opening property. SOLUTION: This is a biaxially oriented polyester film manufactured by use of a raw material which is prepd. by blending a poly...

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Bibliographische Detailangaben
Hauptverfasser:	KISHIDA MINORU, KAWAGUCHI KAZUHIRO
Format:	Patent
Sprache:	eng
Schlagworte:	AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F,C08G AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING CHEMISTRY COMPOSITIONS BASED THEREON COMPOSITIONS OF MACROMOLECULAR COMPOUNDS GENERAL PROCESSES OF COMPOUNDING INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULARARTICLES INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS METALLURGY ORGANIC MACROMOLECULAR COMPOUNDS PERFORMING OPERATIONS SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDEDFOR SHAPING OR JOINING OF PLASTICS THEIR PREPARATION OR CHEMICAL WORKING-UP TRANSPORTING WORKING OF PLASTICS WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL WORKING-UP
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Beschreibung
Zusammenfassung:	PROBLEM TO BE SOLVED: To prepare a polyester film with an excellent straight tearing property, and a packaging bag made therefrom, having an excellent tear opening property. SOLUTION: This is a biaxially oriented polyester film manufactured by use of a raw material which is prepd. by blending a polybutylene terephthalate (modified PBT) comprising 5-20 wt.% of a polytetramethylene glycol unit having a mol.wt. of 600-4,00, and a polyethylene terephthalate(PET) at a PET/modified PBT ratio of 70/30-95/5 (wt.ratio), the modified PBT being dispersed in a shape of long-island-in-the-sea along the film longitudinal direction in the PET, and satisfying the formulae: 10