| 摘要 |
PURPOSE:To obtain a recording medium provided simultaneously with durability and corrosion resistance by forming a resin layer on a recording layer consisting of a thin magnetic metallic film and depositing perfluoropolyether having a carboxylic group at the terminal of the molecule thereon. CONSTITUTION:A film contg. perfluoropolyether having a carboxylic group at the molecule terminal is deposited as a lubricating agent on a resin layer formed on a thin metallic film layer. A protective film having two-layered structure of the resin layer and the perfluoroether layer is thus formed by which corrosion resistance, lubricity and durability are improved. A vinyl chloride/vinyl acetate resin, cellulosic resin, butyral resin, methyl methacrylate, styrene copolymer alone or a blend of >=2 kinds thereof is used as the resin or these resins subjected to crosslinking reaction by bi- or more functional isocyanate compd. are used. The film thickness of the resin layer is made preferably <=1mu. The perfluoropolyether having a carboxyl group at the molecular terminal expressed representatively by the general formula is used as the perfluoropolyether to be deposited on the resin layer. The amt. of the perfluoropolyether to be used is preferably made in 0.01-100mg/m<2> range with respect to the surface of the resin layer. |
