| 摘要 |
Process for producing an oriented polyolefin film using a multi-component polymer composition provided by a primary polymer component comprising an isotactic propylene homopolymer produced by the polymerization of propylene in the presence of a Ziegler-Natta catalyst and a secondary polymer component comprising a metallocene polymerized isotactic propylene polymer having a xylene solubles content which is less than that of the primary polymer component. The secondary polymer component is a propylene homopolymer or an ethylene-propylene random copolymer having an ethylene content of about 0.5 wt. % or less. The polymer components are separately co-extruded to form a multilayer co-extrudate in which the primary polymer component is present in an amount greater than the secondary polymer component. The multilayer co-extrudate is oriented in at least one direction to form an oriented film.
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