POLYESTER FILM FOR METAL PLATE LAMINATING MOLDING PROCESSING

摘要

PROBLEM TO BE SOLVED: To provide the polyester film holding excellent molding processability, heat resistance, retort resistance and impact resistance though being inexpensive and not changing taste of mineral water severely requiring flavor and taste holding properties. SOLUTION: This film is obtained by laminating a copolyester layer (A) having an m.p. of 210-245 deg.C and a glass transition temp. of 60 deg.C or higher and produced by using a germanium compd. as a polycondensation catalyst and a copolyester layer (B) having an m.p. of 210-245 deg.C and produced by using an antimony compd. as a polycondensation catalyst and the total amt. of an alkali metal element contained in the copolyester layer (A) is 5 ppm or less.