Multi-layer, gas-barrier, biaxially oriented, heat-shrink films and their use in deep-drawing applications

摘要

A multi-layer, gas-barrier, biaxially oriented and heat-shrinkable film comprising (a) a first outer heat-sealable layer comprising one or more polyolefins (b) an inner gas-barrier layer comprising at least one gas barrier resin selected from the group comprising vinylidene chloride copolymers (PVDC), ethylene-vinyl alcohol copolymers (EVOH), polyamdes, copolyamides, acrylonitrie-based copolymers, and blends of EVOH with polyamides and/or copolyamides and (c) a second outer abuse resistant layer comprising one or more polyolefins, modified polyolefins, polyesters/copolymers, polyamides/copolyamides, or polystyrene polymers said film being characterized in that it contains at least 28 % by weight of polystyrene polymer.