LAMINATED POLYESTER FILM

PROBLEM TO BE SOLVED: To provide a laminated polyester film of which the characteristics as various kinds of recording mediums, especially as a vapor deposition magnetic recording medium are excellent even when recovered raw materials are used. SOLUTION: This laminated polyester film has a three layer constitution wherein a polyester layer B is laminated on one surface of a polyester layer A, and a polyester layer C is laminated on the other surface of the polyester layer A. The central line average surface roughness RaBon the external surface of the polyester layer B is 2 to 20 nm, and the central line average surface roughness RaCon the external surface of the polyester layer C is 0.7 to 7 nm. Each layer of the polyester layer A, the polyester layer B and the polyester layer C includes a polymer raw material which is recovered from polyester films. Also, the content of the recovered polymer raw material in each layer satisfies formula (1): RCA=30 to 80, formula (2): RCB=10 to 60, formula (3): RCC=0.3 to 2, and formula (4): RCA≥RCB>RCC. In this case, in the formulas, RCA, RCB, and RCCeach represent the content ratio (mass%) of the polymer raw material which has been recovered from polyester films in the polyester layer A, the polyester layer B, and the polyester layer C. COPYRIGHT: (C)2010,JPO&INPIT