| 摘要 |
A metalized or ceramic-coated biaxially oriented polyester film is disclosed, with a base layer B which comprises at least 80% by weight of thermoplastic polyester, and with at least one outer layer A. The 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 from cycloaliphatic or aromatic diols and/or dicarboxylic acids. The thickness of the outer layer A is more than 0.7 mum and this makes up less than 25% by weight relative to the entire film. 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. The film has low permeability to atmospheric oxygen and exhibits very good adhesion between the individual layers. It is particularly suitable for packaging purposes, specifically for packaging foods or other consumable items.
|
