POLYMER FILM AND MAGNETIC RECORDING MEDIUM USING IT

PROBLEM TO BE SOLVED: To obtain a base film having good electromagnetic conversion properties and durability by making the Poisson's ratio of the width direction to the longitudinal direction of the film at least a specified value. SOLUTION: An aromatic polyamide and others are used as the mate...

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Bibliographische Detailangaben
Hauptverfasser:	NAKAJIMA YUICHI, YASHIRO TOSHIYA, TSUKUDA AKIMITSU
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 INFORMATION STORAGE INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORDCARRIER AND TRANSDUCER METALLURGY ORGANIC MACROMOLECULAR COMPOUNDS PERFORMING OPERATIONS PHYSICS 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 obtain a base film having good electromagnetic conversion properties and durability by making the Poisson's ratio of the width direction to the longitudinal direction of the film at least a specified value. SOLUTION: An aromatic polyamide and others are used as the material of a polymer film. The Poisson's ratio of the width direction to the longitudinal direction of the film is made at least 0.4. In this process, the film is stretched in order to have an aimed Poisson's ratio in a wet process in its film making process and in a tenter and to improve its mechanical properties and dimensional stability. A successive biaxial orientation method and others are used at the orientation method. After that, the film is heat-treated, when it is used as a base film for a magnetic recording medium, a magnetic layer is formed on one side or on both sides, and this is slit in a prescribed width to make a magnetic recording medium. In this way, a magnetic tape having good electromagnetic properties and durability can be produced.