POLYESTER FILM FOR MAGNETIC RECORDING MEDIUM AND METHOD FOR EVALUATING QUALITY OF THE SAME

摘要

PROBLEM TO BE SOLVED: To provide a polyester film for a magnetic recording medium suitable for manufacturing a digital video tape provided with both durability and electric characteristics with good productivity. SOLUTION: A discontinuous coating film containing fine particles and easily adhering resin is formed on one side surface of the polyester film for the magnetic recording medium. The easily adhering resin contains an element S(sulfur) and has 3,500-4,100 [count/40 sec] intensity value of the element S measured by a fluorescent X-ray analyzer and the surface A on the side of the discontinuous coating film has 1-4 nm surface roughness.