POLYESTERMEHRSCHICHTFOLIE, EINE MIT DIESER FOLIE BESCHICHTETE METALLPLATTE UND EIN MIT EINER FOLIE BESCHICHTETER BEHÄLTER AUS METALL

摘要

A polyester laminate film comprising plural polyester layers, which comprises one surface layer comprising a polyester and a lubricant having an average particle size of 1-3 mu m in a proportion of 1-5 wt% and the other surface layer comprising a polyester wherein 5-15 mol% of the entire acid component is a dimer acid component, the polyester laminate film having a crystallization peak temperature of 80-120 DEG C under temperature rise of the film. The polyester laminate film of the present invention has a lower crystallization peak temperature when the film is under temperature rise, as compared to conventional polyethylene terephthalate. As a consequence, the film is free of whitening upon retorting, even after the film was subjected to remelting treatment and rapid cooling for noncrystallization and unorienting. Therefore, the film serves well as a laminate film for food containers and beverage cans that undergo retort sterilization. Inasmuch as the polyester layer on one surface contains a large amount of a lubricant and has releasing property, the film serves well as a laminate film for a metal plate, which is required to have releasing property from a mold during manufacture of containers such as a two-piece can. The polyester layer on the other surface contains a large amount of dimer acid and the film is superior in impact resistance. Hence, the film serves well as a laminate film for a metal container which is susceptible to damage due to impact during distribution process.