| 摘要 |
PURPOSE:To form the titled magnetic recording tape capable of prolonging the magnetic recording time, with less fructuations in the output, and having an improved skew by using a biaxially oriented polyethylene-2,6-naphthalate as a base film, and regulating the Young's modulus and thermal shrinkage percentage. CONSTITUTION:The biaxially oriented polyethylene-2,6-naphthalate film has >=800kg/mm<2> Young's modulus in the longitudinal direction, >=500kg/mm<2> Young's modulus in the lateral direction, and <=0.08% thermal shrinkage percentage at 70 deg.C for one hour under no load. A magnetic layer is formed on the film surface to obtain the magnetic recording tape having <=16mum thickness. Any polyethylene-2,6-naphthalate having the repeating unit consisting of a ethylene-2,6-naphthalene dicarboxylate unit can be used. A copolymer wherein <=10%, preferably <=5%, of the repeating units is modified with other components, a mixture with other polymers, and other composition are included as well as an uncopolymerized polyethylene-2,6-naphthalene dicarboxylate. |
