BASE FILM FOR MAGNETIC RECORD MEDIUM

摘要

PURPOSE:To provide a film having excellent scrape resistance, travelling performance and electromagnetic conversion characteristics. CONSTITUTION:A film is made from aromatic polyamide or aromatic polyimide and said film has a film strength of no less than 6kg/mm<2> in at least one direction when the film is stretched by 1% at a tensile speed of 1000%/min and center line average roughness [Ra]0.08 of at least one surface measured at a cutoff value of 0.08mm is in the range of 0.001-0.03mum and a center line average roughness [Ra]0.008 measured at cutoff value of 0.008mm and the [Ra]0.08 satisfy a formula (1) as follows: 0.5<=[Ra]0.008/[Ra]0.08<=0.9.