The invention concerns accordingly a composition having a density of at least 950 kg/m3, a fluidity index MI5 of 0.05 to 2 g/10 min and a content of {TAIL ~ alpha olefin} containing from 4 to 10 carbon atoms of from {HEAD ~ 0.15 to 1 mole %}, comprising: 
The invention concerns accordingly a composition having a density of at least 950 kg / m3 , a fluidity index MI5 of 0.05 to 2 g/10 min and a content of { TAIL ~ alpha olefin } containing from 4 to 10 carbon atoms of from { HEAD ~ 0.15 to 1 mole % } , comprising :
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH