A process for producing polyethylene comprises polymerizing ethylene or copolymerizing ethylene with other α olefin in the presence of {TAIL ~ a catalyst system} obtained by bringing the following components to in {HEAD ~ contact} with one another: 
A process for producing polyethylene comprises polymerizing ethylene or copolymerizing ethylene with other α olefin in the presence of { TAIL ~ a catalyst system } obtained by bringing the following components to in { HEAD ~ contact } with one another :
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 TAIL OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH