Biaxial orentierter, mehrschichtiger Polyesterfilm, geeignet zum Kleben auf Metallblech

摘要

A biaxially oriented laminated polyester film comprising (A) a first layer formed from a first copolyester which is composed of ethylene terephthalate unit as a main recurring unit, and (B) a second layer formed from a polyester composition containing (B1) a second copolyester which is composed of ethylene terephthalate unit as a main recurring unit and (B2) a third (co)polyester which is composed of butylene terephthalate unit as a main recurring unit and is contained in an amount of 1 to 40 % by weight or (B3) a filler having an average particle diameter of 2.5 mu m or less and is contained in an amount of 5 to 30 % by weight in place of the third (co)polyester (B3), the second layer being to constitute a surface to be bonded onto a metal surface when the laminated film is laminated on the metal sheet. This composition can give metal cans, e.g., beverage cans and food cans, excellent in heat resistance, resistance to embrittlement under retort treatment, favor retention, impact resistance and anticorrosive properties.