| 摘要 |
PURPOSE:To enhance scratch resistance and to especially improve dubbing resistance as a magnetic recording body by forming a biaxially oriented thermoplastic resin film by providing a film layer A based on a thermoplastic resin A containing specific inert particles to at least the single surface of a film layer B based on a thermoplastic resin B. CONSTITUTION:As a thermoplastic resin layer B, a crystalline polymer, for example, polyester or polyamide is used. A thermoplastic resin layer A composed of, for example, ethylene terephthalate or ethylene 2,6-naphthalate is formed to the surface of the layer B. The particle size of inert particles, for example, composed of colloidal silica contained in the resin layer A is 0.2-5 times the thickness of the layer A, the content thereof is 0.05-20wt.% and the thickness of the layer A itself is 0.005-3mum. The particles are treated with 0.0001-10.0wt.% of an isocyanate compound and 0.0001-10.0wt.% of a water-soluble polyester compound. |
