Patent ID: 6534169
Filing Date: 2003-03-18
Classification: B32B,B65D,Y10S,Y10T

Abstract:
A transparent, biaxially oriented polyester film comprising:(A) a base layer at least 80% by weight of which is composed of ethylene glycol units and terephthalic acid units; and (B) at least one outer layer, wherein the outer layer is composed of a copolymer comprising at least 40% by weight of ethylene 2,6-naphthalate units; ethylene terephthalate units, wherein the ethylene terephthalate units are present in an amount up to 40% by weight; and 0 to <60% by weight of units selected from the group consisting of aliphatic diols, cycloaliphatic diols, aromatic diols, aliphatic dicarboxylic acids, cycloaliphatic dicarboxylic acids, aromatic dicarboxylic acids, and combinations thereof, wherein the base layer has a diethylene glycol content of from 0.9 to 3.0% by weight.