Flexibler magnetischer Aufzeichnungsträger und Verfahren zu seiner Herstellung

摘要

Disclosed are a data recording cartridge provided with a cartridge case and a recording medium accommodated therein, wherein the cartridge case is molded from at least one of the following materials: (1) composition of uniformly dispersed styrol resin and polycarbonate resin; (2) composition of uniformly dispersed styrol resin and nitrogen containing resin; (3) composition of uniformly dispersed styrol resin and ester resin; (4) styrol resin styrene of which is partially substituted with alpha -methylstyrene; (5) styrene-maleic anhydride copolymer modified with rubber; (6) composition of polypropylene polymer containing an inorganic filler dispersed therein; (7) copolymer of N-substituted maleimide resin and styrol resin; and (8) composition of uniformly dispersed N-substituted maleimide resin and styrol resin, and a method of manufacturing a flexible magnetic recording medium composed of a non-magnetic base film having a magnetic thin film formed thereon, which comprises the step of forming a magnetic thin film on the base film and then effecting the base film with the magnetic thin film formed thereon to be subjected to a heat treatment under the conditions of the temperature of 90 DEG C or more and the humidity of 20% RH or less, wherein the flexible magnetic recording medium has the maximum thermal contraction of 30 micrometers or less when left for 96 hours in the environment of the temperature of 85 DEG C and the humidity of 40% RH.