WHITE, HIGH-GLOSS, POLYESTER FILM CONTAINING CYCLO-OLEFIN COPOLYMERS (COC), A METHOD FOR THE PRODUCTION THEREOF AND THE USE OF THE SAME

摘要

The invention relates to biaxially orientated, co-extruded polyester films, which have at least one base layer that contains a thermoplastic polyester, preferably polyethylene terephthalate and approx. 2 to 60 wt.- % of a cyclo-olefin copolymer that is preferably composed of norbornene and ethylene units and which have at least one cover layer that is devoid of a COC and which optionally have additional cover or intermediate layers and can contain conventional additives such as stabilisers and anti-blocking agents. Said films are characterised in particular by a degree of whiteness > 70 %, an opacity > 55 % and a gloss, (at least on one side) > 100 and are therefore suitable for numerous industrial applications. During the production of the films in accordance with the co-extrusion process, up to 70 wt.- % of reclaimed product can be used, without having a noticeable negative effect on the physical properties of the film.