| 摘要 |
PROBLEM TO BE SOLVED: To produce a polyethylene-2,6-naphthalate film having uniform surface and excellent transportability, abrasion resistance and electrical characteristics and applicable to various uses e.g. magnetic recording medium and electric use such as capacitor. SOLUTION: The objective polyethylene-2,6-naphthalate film contains 0.001-3.0 wt.% of porous spherical silica particles having an average particle diameter of 0.3-15μm, a sphericity ratio of 0.90-1.0 [defined by (projected area of particle)/(equivalent circle area of maximum diameter of the projected plane of particle)], a particle size distribution of 1.2-2.5 [defined by d10 /d90 wherein d10 and d90 are diameters (μm) of the particle corresponding to 10% and 90% of the total volume determined by measuring the cumulative volume of the particles from the side of large diameter] and a specific surface area of 100-600 m<2> /g. |
