| 摘要 |
PURPOSE:To lower the coefft. of friction and to improve traveling durability without impairing other characteristics by incorporating a carbon black having a prescribed average particle and specific compd. into a magnetic layer. CONSTITUTION:The carbon black having >=250mum average particle size is incor porated into the magnetic layer of the magnetic recording medium provided with the magnetic layer consisting of ferromagnetic powder and binder on a nonmagnetic base and further, the ester compd. of tridecyl alcohol and stearic acid and/or palmitic acid is incorporated therein. The content of the carbon black is 1-10pts.wt., more preferably 3-7pts.wt. per 100pts.wt. ferromagnetic metal powder. The mixing ratios of the ester compd. of the tridecyl alcohol and stearic acid and the ester compd. of the tridecyl alcohol and palmitic acid are 80-20mol% to 20-80mol% in the case of using a mixture composed of said compds. The content of the ester compd. in the magnetic layer is 5-20pts. wt., more preferably 9-15pts.wt. per 100pts.wt. ferromagnetic metal powder. |
