CPC C08F 210/06 (2013.01) [C08F 210/16 (2013.01)] | 10 Claims |
1. A propylene ethylene copolymer having the following features:
an ethylene content of between 1.0 and 4.0% by weight;
a molecular weight distribution (MWD), expressed in terms of Mw/Mn, of greater than 4.0;
a content of xylene soluble fraction (XS) and ethylene content (C2) that fulfills the following relationship:
(C2×1.1)+1.25<XS<(C2×1.1)+2.50
where:
XS=% by weight of the fraction soluble in xylene at 25° C.;
C2=% by weight of ethylene units in the propylene ethylene copolymer determined via NMR;
a melt flow rate (MFR; 230° C., 2.16 kg) between 30 and 75 g/10 min;
an intrinsic viscosity of the propylene ethylene copolymer lower than 1.5 dl/g; and
an intrinsic viscosity of the fraction soluble in xylene at 25° C. higher than 0.32 dl/g.
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