Propylene ethylene random copolymer
A propylene ethylene copolymer having: (i) an ethylene derived units content (C2) ranging from 2.0 wt % to 11.0 wt %, based upon the total weight of the copolymer; (ii)) a fraction soluble in xylene (Xs) at 25° C. (Xs) ranging from 7.1 wt % to 28.5 wt %, based upon the total weight of the copolymer; (iii) an intrinsic viscosity of the fraction soluble in xylene at 25° C. ranging from 3.2 dl/g to 5.6 dl/g; (iv) a melting point (Tm) higher than 140.0° C. and fulfilling the relation (I): Tm> 155−1.4× C 2 (I); and (v) a flexural modulus (TM) higher than 500 MPa and fulfilling the relation (II) TM> 1900−285× C 2+50× Xs (II).
1. A propylene ethylene copolymer having:
(i) an ethylene derived units content (C2) ranging from 2.0 wt % to 11.0 wt %, based upon the total weight of the copolymer;
(ii)) a fraction soluble in xylene at 25° C. (Xs) ranging from 7.1 wt % to 28.5 wt %, based upon the total weight of the copolymer;
(iii) an intrinsic viscosity of the fraction soluble in xylene at 25° C. ranging from 3.2 dl/g to 5.6 dl/g;
(iv) a melting point (Tm) higher than 140.0° C. and fulfilling the relation (I):
Tm> 155−1.4× C 2 (I),
wherein Tm is the melting point of the propylene ethylene copolymer measured by DSC and C2 is the wt % of ethylene derived units of the propylene ethylene copolymer, based upon the total weight of the copolymer; and
(v) a flexural modulus (TM) higher than 500 MPa and fulfilling the relation (II)
TM> 1900−285× C 2+50× Xs (II),
wherein TM is the flexural modulus in MPA, C2 is the wt % of ethylene derived units of the propylene ethylene copolymer, based upon the total weight of the copolymer, and Xs is the fraction soluble in xylene at 25° C. (wt %) of the propylene ethylene copolymer, based upon the total weight of the copolymer.
2. The propylene ethylene copolymer according to claim 1 having a melt flow rate MFR, (ISO 1133 (230° C., 2.16 kg) ranging from 0.2 g/10 min to 100 g/10 min.
3. The propylene ethylene copolymer according to claim 1 having the ethylene derived units content ranging from 3.3 wt % to 10.2 wt %, based upon the total weight of the copolymer.
4. The propylene ethylene copolymer according to claim 1 , wherein the fraction soluble in xylene at 25° C. ranges from 8.2 wt % to 25.3 wt %, based upon the total weight of the copolymer.
5. The propylene ethylene copolymer according to claim 1 , wherein the intrinsic viscosity of the fraction soluble in xylene at 25° C. ranges from 3.5 dl/g to 5.2 dl/g.
6. The propylene ethylene copolymer according to claim 1 , wherein relation (I) is Tm>156−1.4×C2.
7. The propylene ethylene copolymer according to claim 1 , wherein relation (II) is TM>1920−285×C2+50×Xs.
8. The propylene ethylene copolymer according to claim 1 having the ethylene derived units content ranging from 3.8 wt % to 9.2 wt %, based upon the total weight of the copolymer.
9. The propylene ethylene copolymer according to claim 1 , wherein the fraction soluble in xylene at 25° C. ranges from 9.1 wt % to 22.0 wt %, based upon the total weight of the copolymer.
10. The propylene ethylene copolymer according to claim 1 , wherein the intrinsic viscosity of the fraction soluble in xylene at 25° C. ranges from 3.7 dl/g to 5.0 dl/g.