A BIAXIALLY ORIENTED POLYESTER FILM FOR LAMINATING METALLIC SHEETS

摘要

A biaxially oriented polyester film is suitable for laminating onto a metall ic sheet so as to provide a laminate capable of being formed into a can. The polyester film comprises at least one of: (1) a polyester having a melting point of 246 to 280 .degree.C and being suc h that when the laminate is formed into a can, then at a neck of the can the film provides an inner 1 to 3 .mu.m portion (a) close to the metallic sheet and an outer 1 ~ 3 .mu.m portion (b) remote from the metallic sheet, which said portions (a) and (b) have respective average orientation intensity ratios, as measured by Raman spectrometry, of 6 or less and 8 or more; and (2) a polyester layer (A) of a polyester having at least 93 mol% thereof of units derived from ethylene terephthalate and/or ethylene naphthalate and a polyester layer (B) of a polyester containing an ionomer and which film has a face orientation factor of 0.10 to 0.15.