公开(公告)号：US20170216825A1

公开(公告)日：2017-08-03

申请号：US15500647

申请日：2015-07-30

Applicant: VERSALIS S.P.A.

Inventor： Francesco MASI ,  Anna SOMMAZZI ,  Mario POLESELLO

IPC: B01J27/138 ,  C08F210/16 ,  C08F4/655 ,  B01J27/135

CPC classification number: B01J27/138 ,  B01J27/135 ,  C08F4/655 ,  C08F210/16 ,  C08F2410/03 ,  C08F4/6557 ,  C08F210/14 ,  C08F2500/12 ,  C08F4/6555

Abstract: An improved solid Ziegler-Natta type catalyst for the (co)polymerisation of ethylene and α-olefins, particularly in high-temperature processes, such as for example adiabatic solution processes and high-pressure adiabatic processes with elevated productivity, is provided. Said catalyst is obtained by means of an original process comprising dissolving in hydrocarbons, compounds of titanium, magnesium and optionally a metal selected from hafnium and zirconium, and reprecipitating them in two steps in succession, the first of which is chlorination and the second reduction.