Patent ID: 6054212
Filing Date: 2000-04-25
Classification: B32B,B65D,C08J,Y02W,Y10T

Abstract:
A transparent, biaxially oriented polyester film having a base layer of at least 80% by weight based on the total weight of the base layer of at least one thermoplastic polyester, and having at least one cover layer, wherein the cover layer is composed of a polymer or a mixture of polymers which comprises at least 50% by weight of ethylene 2,6-naphthalate units; and ethylene terephthalate units at up to 40% by weight; and 0% up to 60% by weight of units from aliphatic, cycloaliphatic or aromatic diols, and/or optionally aliphatic, cycloaliphatic, or aromatic dicarboxylic acids; with the proviso that the T.sub.g 2 value of the polyester film is above the T.sub.g 2 value of the base layer but below the T.sub.g 2 value of the cover layer.