| 摘要 |
PROBLEM TO BE SOLVED: To provide a biaxially oriented laminated polyester film which has good properties such as flatness, slipping, cut resistance, and winding and is useful as a magnetic recording medium. SOLUTION: In a laminated polyester film in which a polyester layer A is laminated on one side of a polyester layer B, the average roughness WRaA of the central surface of the layer A is 1-15nm, the average roughness WRaB of the central surface of the layer B is 0.1-8nm, WRaA>WRaB, and an air leakage index G is -1×10<-2> --1×10<-4> . |
