| 摘要 |
PURPOSE:To provide a biaxially oriented polyester film for a magnetic recording medium having excellent surface uniformity, travelling and abrasion resistance. CONSTITUTION:A biaxially oriented polyester film is manufactured by co- extruding and laminating a polyester (A) layer and a polyester (B) layer, and the biaxially oriented polyester film for a magnetic recording medium simultaneously satisfying the following formulae (1)-(11). 0.30<=da<=0.65...(1), 0.35<=waA<=1.00...(2), 0.55<=da+0.5waA<=0.95...(3), 8da-WaA>=1.50...(4), 0.005<=db<=0.50...(5), 0.15<=wbA<=1.00...(6), wb<=0.10...(7), 0.009<=RaA<=0.020...(8), 0.002<=RaB<=0.017...(9), 7.0<=RzA/RaA<=15...(10) and 0.80<=mud50A/mud1A<=1.6...(11). |
