BIAXIALLY ORIENTED POLYESTER FILM FOR MOLDED MEMBER, MOLDING LAMINATE INCLUDING THE SAME, AND PROCESS FOR PRODUCING THE SAME

• Main Authors: SHIMIZU, KUNIMITSU, TAKIZAWA, YOSUKE
• Format: Patent
• Language: English; French; Japanese
• Published: 02.10.2008
• Subjects: 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; 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; 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

[PROBLEMS] To provide a biaxially oriented polyester film for molded members which has a high elongation, can be easily thermally formed into an intended shape, and has an excellent appearance even when having a thin metal film formed thereon. [MEANS FOR SOLVING PROBLEMS] The biaxially oriented polyester film for molded members satisfies the following requirements (1) to (5). (1) The polyester film has a melting point of 240-260°C; (2) the film has machine-direction (MD) and transverse-direction (TD) elongations measured at 150°C of 300-700% each; (3) the sum of the MD heat shrinkage (SMD) and the TD heat shrinkage (STD) each measured at 190°C, SMD+STD, is 10% or less; (4) the sum of the MD stress of heat shrinkage (YMD) and the TD stress of heat shrinkage (YTD) each measured at 150°C, YMD+YTD, is 40 g/10 mm-width or less; and (5) the film has MD and TD Young's moduli of 1.5-4.5 GPa each. [PROBLEMES] L'invention concerne un procédé permettant de produire un film de polyester orienté biaxialement, destiné à des éléments moulés et qui présente un allongement élevé, peut être aisément façonné thermiquement en une forme voulue et présente un très bon aspect, même lorsqu'un film métallique mince est formé sur ledit film. [SOLUTIONS] Ce film de polyester orienté biaxialement et destiné à des éléments moulés répond aux critères suivants (1) à (5). (1) Le film de polyester comporte un point de fusion de 240-260°C; (2) le film présente un allongement dans le sens machine (MD) et un allongement dans le sens transversal (TD) mesurés chacun à 150°C, de 300-700%; (3) la somme du retrait thermique MD (SMD) et du retrait thermique TD (STD), mesurés chacun à 190°C, SMD+STD, est égale ou inférieure à 10%; (4) la somme de la contrainte MD du retrait thermique (YMD) et de la contrainte TD du retrait thermique (YTD) mesurées chacune à 150°C, YMD+YTD, est égale ou inférieure à 40 g/10 mm-largeur ; et (5) le film présente des modules de Young MD et TD compris chacun entre 1,5 et 4,5 GPa.