| 摘要 |
PURPOSE:To increase the running durability of a magnetic recording medium and to reduce dropout and edge folding, by forming a background layer including SnO2 powder and a binder on opposite side of a nonmagnetic substance base having a magnetic layer on the surface. CONSTITUTION:On one side of a nonmagnetic support base such as a polyethylene terephthalate film, a magnetic layer is provided, and a background layer, <=1mu thickness having inorganic powder including SnO2 powder and a binder is formed on other side to form an objective magnetic recording medium. The SnO2 powder included in the background layer can simply be used and also can be mixed with inorganic powder such as graphite, carbon black powder, and silicon dioxide. As the binder, a mixture of a cellulose resin, a thermoplastic polyurethane elastomer and polyisocyanate is preferred, and the ratio of the inorganic powder to the binder in wt. ratio is preferably in the range of 2.5/1- 0.1/1. |
