Sealable, opaque, biaxially orientated multilayer polypropylene film, process for its production and its use

Abstract

A sealable, opaque, biaxially orientated multilayer polpropylene film comprising a core layer and (an) intermediate layer(s) located on one or both sides of the core layer and (a) top layer(s) located on one or both sides of the intermediate layer(s) or the core layer, wherein the core layer contains a polypropylene polymer or a polypropylene mixture and calcium carbonate having an average particle diameter of 1 to 2 .mu.m; the intermediate layer(s) comprise(s) a polypropylene polymer or a polypropylene mixture; at least one top layer has a thickness of .ltoreq.0.4 .mu.m; and the top layer(s) comprise(s) a copolymer of ethylene and propylene or ethylene and butylene or propylene and butylene or ethylene and another .alpha.-olefin having 5 to 10 carbon atoms or propylene and another .alpha.-olefin having 5 to 10 carbon atoms or a terpolymer of ethylene and propylene and butylene or ethylene and propylene and another .alpha.-olefin having 5 to 10 carbon atoms or a mixture of one or more of the co- and/or terpolymers mentioned with polypropylene or a mixture of two or more of the co- and/or terpolymers mentioned, has a combination of properties rendering it suitable as a packaging or wrapping film.

Dependencies are inferred from the claim text.