High density polyethylene for the production of pipes
The invention is directed to polyethylene having a density in the range≥940 and ≤960 kg/m 3 , Melt Flow Rate 190/21.6≥1.5 and ≤4.0 g/10 min at 190 degrees Celsius and MWD≥3 and ≤12. The polyethylene is applied in the production of pipes.
1. Polyethylene having
a monomodal distribution,
a density in the range ≥939 and ≤960 kg/m 3 (measured according to ISO 1183 A),
a Melt Flow Rate 190/21.6 in the range of ≥1.5 and ≤4.0 g/10min at 190 degrees Celsius (measured according to ISO1133),
an MWD in the range of ≥3 and ≤12,
a shape of molecular weight distribution as described by half width between 1.0 and 1.45, and
wherein the polyethylene is obtained with a Ziegler Natta catalyst.
2. The polyethylene according to claim 1 , wherein
the density is ≥939 and ≤955 kg/m 3 and
the Melt Flow Rate 190/21.6 is ≥1.8 and ≤3.0 g / 10 min.
3. Extrudable polyethylene having
a density in the range ≥939 and ≤960 kg/m 3 (measured according to ISO 1183 A),
a Melt Flow Rate 190/21.6 in the range of ≥1.5 and ≤4.0 g/10min (measured according to ISO1133),
an MWD in the range of ≥3 and ≤12,
a shape of molecular weight distribution as described by half width between 1.0 and 1.45 and
having an abrasion resistance of less than 300% (measured according to ISO15527:2010 Annex B for 24 hours using the abrasion of GUR® 4120 of Ticona sample as the reference at 100%).
4. A pipe comprising a polymer, wherein the polymer is only the polyethylene according to claim 3 .
5. A multi-layer pipe comprising at least one layer comprising polyethylene according to claim 3 as the inner layer of the pipe.
6. The multi-layer pipe according to claim 5 , wherein the pipe is a slurry pipe.
7. The multi-layer pipe accordingly to claim 5 , wherein the outer layer comprises a polyethylene material with an MRS of 8 MPa and PE 100 is a PE material with an MRS of 10 MPa. The pipe classification is elucidated at page 35 of “PE 100 Pipe systems” (edited by Brömstrup; second edition, ISBN 3-8027-2728-2).
8. The pipe according to claim 4 , wherein the pipe is a slurry pipe.
9. A pipe comprising a polymer, wherein the polymer is only the polyethylene according to claim 1 .
10. The pipe according to claim 8 , wherein the pipe is a slurry pipe.
11. A multi-layer pipe comprising a layer comprising polyethylene according to claim 1 as the inner layer of the pipe.
12. The pipe according to claim 10 , wherein the pipe is a slurry pipe.