BIAXIALLY ORIENTD MULTILAYERED POLYOLEFIN FILM WHICH IS PRINTABLE AND OF WHICH BOTH SIDES ARE SEALABLE, ITS PRODUCTION AND USE

摘要

In the novel opaque polyolefin film having a base layer essentially comprising propylene polymers and having heat-sealable layers on both sides essentially comprising heat-sealable olefin polymers, one of the two heat-sealable layers incorporates from 0.2 to 1.5 % by weight based on the layer, of polydialkylsiloxane, and this layer has not been corona treated, and the other heat-sealable layer has been corona treated and has not incorporated polydialkylsiloxane, but instead polydialkylsiloxane is present on the outer surface of this layer and has been transferred to the former on contact of the polydialkylsiloxane-incorporated heat-sealable layer with the other heat-sealable layer, the relative content of polydialkylsiloxane determined using ESCA spectroscopy, is at most 15. The three-layer, opaque polyolefin film is produced by coextrusion and is particularly suitable as a packaging film on high-speed packaging machines.