Patent ID: 6866920
Filing Date: 2005-03-15
Classification: B32B,Y10S,Y10T

Abstract:
1. A transparent, biaxially oriented polyester film with a base layer B which is composed of at least 80% by weight of a thermoplastic polyester, and with an outer layer A directly adhered to base layer B, and with a polymeric layer arranged on that side of the film opposite to the outer layer A, wherein the outer layer A comprises a copolymer or a mixture of homo- and copolymers which comprises 91 to 98% by weight of ethylene 2,6-naphthalate units and up to 9% by weight of ethylene terephthalate units, and/or units made from cycloaliphatic or aromatic diols and/or dicarboxylic acid; the thickness of the outer layer A is more than 0.7 μm and the outer layer A makes up less than 25% by weight of the entire film; the T the polymeric layer arranged on that side of the film opposite to the outer layer A is composed of a copolymer having acrylic and/or methacrylic crosslinking, said film exhibiting an oxygen transmission of less than 85 cm