MULTILAYER, STRETCHED HEAT-SEALABLE POLYPROPYLENE FILM

摘要

A MULTILAYER, STRETCHED HEAT-SEALABLE POLYPROPYLENE FILM A b s t r a c t The invention relates to an oriented sealable polypropylene film combining an improved water vapor barrier effect with considerably reduced global migration for packaging purposes and having the following layer structure: A B C B A where a) C is a base layer of polypropylene and a hydrocarbon resin which has a molecular weight of up to about 2000 g/mol and a softening point above 130.degree.C, b) the B's are jacket layers of highly isotactic poly propylene (isotacticity >94%) free from hydrocarbon resin, the ratio between the thickness of a jacket layer and the thickness of the base layer being between 0.01 and 0.1, c) the A's are two surface layers of a heat-sealable polyolefin copolymer or terpolymer, these surface layers containing at least one antiblocking agent, a lubricant and an antistatic agent.