BIAXIALLY COLD-STRETCHED VINYLIDENE FLUORIDE POLYMER FILM AND ITS PREPARATION

PURPOSE:To prepare a biaxially cold-stretched vinylidene fluoride polymer film excellent in the mechanical strengths at a low cost by biaxially cold- stretching a specific vinylidene fluoride polymer by the inflation process. CONSTITUTION:A vinylidene fluoride polymer having an inherent viscosity of...

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Bibliographische Detailangaben
Hauptverfasser:	OTA MITSURU, TERASAKI SHUJI, KAKIZAKI SHOZO
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:	PURPOSE:To prepare a biaxially cold-stretched vinylidene fluoride polymer film excellent in the mechanical strengths at a low cost by biaxially cold- stretching a specific vinylidene fluoride polymer by the inflation process. CONSTITUTION:A vinylidene fluoride polymer having an inherent viscosity of 0.8-1.6dl/g and a ratio of the wt.-average mol.wt. to the number-average mol.wt. of 10-20, or a polymer mixture comprising at least 30wt.% above- mentioned vinylidene fluoride polymer and 70wt.% or lower vinylidene fluoride polymer having a ratio of the wt.-average mol.wt. to the number-average mol.wt. of 10 or lower is biaxially cold-stretched pref. in a stretching ratio of at lest 1.5 in both the longitudinal and transverse directions by the inflation process.