| 摘要 |
PURPOSE:To obtain excellent scratch resistance and electromagnetic conversion properties by forming strong projections on the surface of a laminated film layer by adding particles treated with alumine oxide to at least one surface layer. CONSTITUTION:In a biaxially oriented laminated film having at least two laminated structures, particles treated with an aluminic acid compd., for example, magnesium aluminate or calcium aluminate are added to at least one surface of the film. As the particles, silica particles or titanium oxide particles are designated but silica particles are especially pref. Particles whose particle size is too large with respect to the thickness of the film are not pref. and the ratio of the thickness of the particle-containing layer and the average particle size of the particles is pref. 1-100. The content of the particles treated with the aluminic acid compd. is pref. 0.1-5% by wt. of the particle-containing film. |
