MEHRSCHICHTIGE, GERECKTE, HEISSSIEGELBARE, HOCHGLEITFÄHIGE POLYPROPYLENFOLIE MIT VERBESSERTEN BARRIEREEIGENSCHAFTEN

摘要

The present invention relates to oriented, heat-sealable polypropylene films having an improved water vapour barrier action at the same time as a considerably reduced coefficient of friction for packaging purposes, characterised in that they contain no polydimethylsiloxane and have the layer structure ABCBA, where a) C is the core layer comprising polypropylene and a hydrocarbon resin with a molecular weight of up to about 2000 g/mol and a softening point of above 130@, and from 0.05 to 0.5% by weight of erucamide, b) B are two hydrocarbon resin-free jacket layers of highly isotactic polypropylene having an isotacticity of > 94%, where the ratio between the thickness of the jacket layer and the thickness of the base layer is between 0.01 and 0.1, and c) A are two top layers of a heat-sealable polyolefin copolymer or terpolymer, where these top layers contain at least one antiblocking agent, an antistatic and, as lubricant, from 0.05 to 0.5% by weight of erucamide.