Patent ID: 6703119
Filing Date: 2004-03-09
Classification: B32B,Y10T

Abstract:
A biaxially oriented polyester film with a base layer B, which comprises at least 80% by weight of thermoplastic polyester, and with at least one outer layer A and with a metallic or ceramic layer arranged on the outer layer A and said film having an adhesion between the individual layers of greater than or equal to 0.5 N/25 mm, whereinthe outer layer A is composed of a copolymer or of a mixture of polymers/copolymers, which contains from 90 to 98% by weight of ethylene 2,6-naphthalate units and up to 10% by weight of ethylene terephthalate units, and/or units derived front cycloaliphatic or aromatic diols and/or dicarboxylic acids; the thickness of the outer layer A is more than 0.7 &mgr;m and this makes up less than 25% by weight relative to the entire film, and the Tg2 value of the polyester film is above the Tg2 value of the base layer but below the Tg2 value of the outer layer.