Patent ID: 8476395
Filing Date: 2013-07-02
Classification: C08F,C08J

Abstract:
1. Polypropylene composition comprising a propylene homopolymer or a propylene random copolymer having at least one comonomer selected from alpha-olefins with 2 or 4-8 carbon atoms and a comonomer content of not more than 8.0 wt %, wherein the propylene homo- or copolymer is polymerized in the presence of a Ziegler-Natta catalyst, and the polypropylene composition has a MWD of 3.5 to 6.0 and an MFR (2.16 kg/230° C.) of 4.0 g/10 min to 20.0 g/10 min determined according to ISO 1133, characterized in that the polypropylene composition has not been subjected to a vis-breaking step, has a haze of not more than 3.5%, determined according to ASTM D 1003/92, when cast into a film with a thickness of 50 micrometers, has a clarity of at least 96.0%, determined according to ASTM D 1003/92, when cast into a film with a thickness of 50 micrometers, and wherein the polypropylene composition has a tensile modulus in machine direction and in transverse direction of at least 450 MPa, determined according to ISO 527-3, when cast into a film with a thickness of 50 micrometers.