US 11,834,534 B2
Random propylene-ethylene copolymers
Gianpiero Ferraro, Ferrara (IT); Gianni Vitale, Ferrara (IT); Fabrizio Piemontesi, Ferrara (IT); Benedetta Gaddi, Ferrara (IT); Gianni Collina, Ferrara (IT); Giampiero Morini, Ferrara (IT); Caroline Cathelin, Ferrara (IT); Marco Ciarafoni, Ferrara (IT); and Claudio Cavalieri, Ferrara (IT)
Assigned to Basell Poliolefine Italia S.r.l., Milan (IT)
Appl. No. 17/268,653
Filed by BASELL POLIOLEFINE ITALIA S.R.L., Milan (IT)
PCT Filed Aug. 12, 2019, PCT No. PCT/EP2019/071524
§ 371(c)(1), (2) Date Feb. 16, 2021,
PCT Pub. No. WO2020/038746, PCT Pub. Date Feb. 27, 2020.
Claims priority of application No. 18190227 (EP), filed on Aug. 22, 2018.
Prior Publication US 2021/0179751 A1, Jun. 17, 2021
Int. Cl. C08F 210/16 (2006.01); C08F 210/06 (2006.01)
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.