| 摘要 |
A simultaneously bioriented coextruded film, comprising the following layers:
a) a core layer of propylene homopolymer, or propylene copolymer with ethylene and/or alpha olefins from 4 to 8 carbon atoms, having a MFI (Melt Flow Index, ISO 1133, 230°C/10 min) of at least 1.5-10 g/10 min;
b) an adhesive skin layer, constituted by ethylene copolymers with alpha olefins from C 3 to C 12 , having density (ASTM 792) from 0.887 g/cm 3 to 0.916 g/cm 3 , or by ethylene copolymers with vinylacetate (EVA) wherein the vinyl acetate monomer ranges from 2% to 14% by moles, said ethylene copolymers having MFI (ASTM D 1238, 190°C/2.16 Kg) from 1 to 10 g/10 min;
the adhesive skin layer b) being polarized at the surface.
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