Patent ID: 7205040
Filing Date: 2007-04-17
Classification: B32B,C08J,Y10S,Y10T

Abstract:
1. A coextruded, biaxially oriented polyester film which has a base layer (B) and has a coextruded, uncoated heatsealable outer layer (A) that can be peeled from APBT/CPET and from OPET, where the outer layer (A) comprises a) from 80 to 99% by weight of polyester and b) from 1 to 10% by weight of inorganic and/or organic particles with a median diameter d c) the polyester used to form said layer (A) is composed of from 12 to 89 mol % of units derived from at least one aromatic dicarboxylic acid and of from 11 to 88 mol % of units derived from at least one aliphatic dicarboxylic acid, where the total of the dicarboxylic-acid-derived molar percentages is 100, d) the ratio calculated from the particle size d e) the base layer (B) comprises polyester and a singe oxygen barrier consisting of poly(m-xyleneadipamide), f) said film does not tear during removal from CPET, and g) said top layer (A) exhibits a surface roughness, Ra, ranging from greater than 80 to 400 nm, as determined via DIN 4768.