Patent ID: 6200511
Filing Date: 2001-03-13
Classification: B32B,Y10T

Abstract:
A biaxially oriented polyester film comprising:(A) a base layer at least 80% by weight of which is composed of one or more thermoplastic polyesters; and(B) at least one outer layer, wherein the outer layer is composed of a copolymer or of a mixture of polymers which comprises at least 35 mol % of ethylene 2,6-naphthalate units, from 0 mol % up to 44 mol % of ethylene terephthalate units, from 1 to 20 mol % of ethylene isophthalate units, from 0 mol % up to 20 mol % of a sulfo-substituted aromatic dicarboxylic acid and from 0 mol % up to 10 mol % of units from aliphatic diols, cycloaliphatic diols, aromatic diols, aliphatic dicarboxylic acids, cycloaliphatic dicarboxylic acids, aromatic dicarboxylic acids, or a combination thereof.