Transparent polyester film with a high oxygen barrier, a method for their preparation and their use

摘要

Disclosed is a transparent, biaxially oriented polyester film with a base layer, which leads to at least 80 w -% of a thermoplastic polyester, and at least one covering layer, which is characterized in that the cover layer consists of a polymer or a mixture of polymers, the at least 40 w -% ethylene - 2,6 - naphthalene - terephthalate units and up to 60 w -% of ethylene terephthalate - units and / or units of cycloaliphatic or aromatic diols and / or dicarboxylic acids, with the proviso that the t φ g of φ 2 - value of the polyester film by means of the t φ g of φ 2 - value of the base layer, but below the tg φ g of φ 2 - value of the cover layer, and the base layer contains particles. The film has a low permeability for oxygen. It is particularly suitable for packaging purposes, especially for the packaging of life - and non-essential consumables such as, as can - liner, the cover foil or ttr - vol.