BIAXIALLY DRAWN COLORED POLYESTER FILM FOR LAMINATING METAL SHEET

摘要

[Problem] To provide a biaxially drawn colored polyester film for laminating and forming metal sheet that: exhibits excellent formability such that even under severe processing or high-temperature heat treatments, the film is prevented from chipping or cracks during forming into a can etc.; and yields formed articles such as cans that have excellent concealability, appearance, and printability.;[Solution] The invention is arrived at using a biaxially drawn colored polyester film for laminating and forming metal sheet. Said film comprising at least two layers of: a surface layer (layer A) mainly composed of a polyester having a melting point TmA of 230 to 260° C., layer A having a coloring pigment with an amount of 10 wt % or less, a polymer component with intrinsic viscosity of 0.46 or more, and a water contact angle of 70 to 120° on an outer surface; and a substrate layer (layer B) mainly composed of a polyester having a melting point TmB of 230 to 260° C. and a coloring pigment, layer B having a polymer component with intrinsic viscosity of 0.46 or more and the coloring pigment with an amount of more than 10 wt % and 50 wt % or less; wherein |TmB−TmA| is 4° C. or less.