POLYESTER FILM FOR LAMINATING METAL PLATE, METAL PLATE AND METAL VESSEL FORMED BY USING THE SAME

摘要

PROBLEM TO BE SOLVED: To provide a film suitable for a metallic can laminated by the film, in which heat laminating properties for a metal plate, formability of the can, especially higher-order workability such as draw forming and squeeze forming is excellent and furthermore taste keeping properties and flavor keeping properties of contents are excellent. SOLUTION: A laminated film of at least two or more layers is comprised of laminating both a polyester layer A and a polyester layer B. (1) The layer A consists of both 94-45 wt.% PBT or polyester (I) comprising this as the main constituent and 10-55 wt.% PET or polyester (II) comprising this as the main constituent. Ester exchange index (I) and (II) contained in the layer A is 1-10%. (2) The layer B consists of 25-55 wt.% (I) and 75-45 wt.% (II) and the ester exchange index of (I) and (II) contained in the layer B is <=7%. (3) The layer A is a film having a melting point of (I) at 200-223 deg.C and the layer B is the film having a melting point of (II) at 230-256 deg.C.