| 摘要 |
PURPOSE:To obtain a magnetic recording medium having good running property, wear resistance and durability by forming a thin ferromagnetic metallic film on a nonmagnetic substrate and laminating a rust preventive agent layer essentially consisting of phenols and lubricating agent contg. a perfluoroalkyl carboxylate thereon. CONSTITUTION:The thin film 2 is formed on the nonmagnetic substrate 1 by dispersing ferromagnetic metallic powder into an org. binder, coating the dispersion on the substrate and drying the coating. Resorcin, o-cresol, etc. are coated as the rust preventive agent 3 thereon. The perfluoroalkyl carboxylate expressed by CnFmCOOCaXb is further superposed as the lubricating agent 4 thereon. In the formula, X is H, F or both thereof and n>=6, m<=2n+1, a>=8, b<=2n+1, CaXb is a straight chain alkyl group of 18<a or aliphat. hydrocarbon group having double bonds or branch of a>18, for which a nonadecafluorodecanoic acid isostearyl ester, etc., are used. The coated amt. of the layers 3, 4 is made about 1-20mg/m<2>. The agents used for the conventional recording media may be used in combination for the layers 3, 4. |
