PRODUCTION OF HEAT-RESISTANT POLYESTER FILM

PROBLEM TO BE SOLVED: To produce a polyester film low in the content of a cyclic trimer and an oligomer and having excellent heat resistance and electric insulating properties. SOLUTION: A polyester resin satisfying formula [COOH]/[IV] < 50 is extruded in a molten state to be biaxially stretched...

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Hauptverfasser:	RI EICHIN, KIN SHOICHI, SOU ITSUTEN
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 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 MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONSONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS 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 produce a polyester film low in the content of a cyclic trimer and an oligomer and having excellent heat resistance and electric insulating properties. SOLUTION: A polyester resin satisfying formula [COOH]/[IV] < 50 is extruded in a molten state to be biaxially stretched and heat-treated so as to satisfy formula 1.0