A BLEND OF POLYPROPYLENE + ETHYLENE BASED COPOLYMER + MODIFIER AND A BLEND OF POLYETHYLENE MODIFIER TO FORM A MULTILAYER FILM

摘要

Polymer blends are used in making multiple layer films suitable e.g. for packaging. In some layers of the films an elastomer or ethylene-based copolymer is blended with polypropylene, and in some layers, with polyethylene; typical films have two to five layers, in multilayer films, at least one layer (14) is a blend of polyethylene, preferably high density polyethylene, with elastomer and/or ethylene-based copolymers, and another layer (12) is polypropylene blended with elastomers and/or ethylene-based copolymers. A two layer film has two layers, one layer (12) having polypropylene and polyethylene, preferably high density polyethylene blended together. …Such films can be used to fabricate packaging bags or pouches by forming heat seals (18) between confronting pieces of film; such bags or pouches are retort sterilisable and suit the packaging of medical fluids.