Propylene-based copolymer composition for pipes
The present disclosure relates to a polyolefin composition comprising, in some embodiments: A) 90.0-99.0 wt % of a propylene homopolymer; B) f1.0-10.0 wt % of a propylene/ethylene copolymer composition comprising: b1) 14-52 wt % of a propylene homopolymer or a propylene/ethylene copolymer; b2) 48-86 wt % of a propylene ethylene copolymer comprising an ethylene derived units content of 20.0-55.0 wt %; wherein the resulting polyolefin composition has a melt flow rate (MFR; ISO 1133, 230° C., 5 kg) of 0.2-4.0 g/10 min; the sum of A+B equals 100% by weight and the sum of b1+b2 equals 100% by weight.
1. A polyolefin composition comprising:
A) 90.0-99.0 wt % of a propylene homopolymer comprising:
(i) a polydispersity index (PI) ranging from 5-10;
(ii) a xylene soluble content at 25° C. of 1.0-4.0 wt %;
(iii) a melt flow rate (MFR; ISO 1133; 230° C./5 kg) of 0.2-3.5 g/10 min;
B) 1.0-10.0 wt %; of a propylene/ethylene copolymer comprising:
b1) 14-52 wt % of a propylene homopolymer or a propylene/ethylene copolymer having a content of ethylene derived units of 0.1-4.5 wt %; having a xylene soluble content measured at 25° C. of lower than 10 wt %; and a melt flow rate (MFR; ISO 1133; 230° C., 2.16 kg) of 50-120 g/10 min;
b2) 86 wt % of a propylene ethylene copolymer having a content of ethylene derived units of 20.0-55.0 wt %;
where the resulting polyolefin composition has a melt flow rate (MFR; ISO 1133, 230° C., 5 kg) of 0.2-4.0 g/10 min; the sum of A+B equals 100% by weight and the sum of b1+b2 equals 100% by weight.
2. The polyolefin composition of claim 1 , where component A) is 95-98.5 wt % and component B) is 1.5-5.0. wt %.
3. The polyolefin composition of claim 1 , wherein component B) subcomponent b1) is 22-38 wt % and subcomponent b2) is 62-78 wt %.
4. The polyolefin composition of claim 1 , where the resulting polyolefin composition has an melt flow rate (MFR; ISO 1133, 230° C., 5 kg) of 0.5-2 g/10 min.
5. The polyolefin composition of claim 1 , wherein component B) subcomponent b1) is a propylene homopolymer.
6. The polyolefin composition of claim 1 , wherein component B) subcomponent b2) is propylene ethylene copolymer comprising an intrinsic viscosity of the xylene soluble fraction at 25° C. of 1.5-3.9 dl/g.
7. A pipe comprising the polyolefin composition of claim 1 .
8. The pipe of claim 6 , comprising a sewage pipe.