公开(公告)号：US20240002560A1

公开(公告)日：2024-01-04

申请号：US18017439

申请日：2021-07-23

Applicant: BOREALIS AG

Inventor： Georgy KIPIANI ,  Jyrki KAUHANEN ,  Felice DE SANTIS ,  Marja MUSTONEN ,  Matthias HOFF ,  Kalin SIMEONOV ,  Kimmo HAKALA ,  Jarkko HASSINEN ,  Maria RANIERI ,  Esko SAIKKONEN ,  Tiina HÄMÄLÄINEN ,  Stefan POLLHAMMER ,  Pascal CASTRO ,  Irfan SAEED ,  Kalle KALLIO

IPC: C08F210/16

CPC classification number: C08F210/16 ,  C08F2420/07

Abstract: The invention provides a process for the preparation of a multimodal ethylene polymer in a multistage process in the presence of a catalyst comprising a complex of formula (lx) wherein each X is a sigma donor ligand; each Het is independently a monocyclic or multicyclic heteroaromatic or heterocyclic group containing at least one heteroatom selected from O, N or S; L is a carbon, silicon or germanium based divalent bridge in which one or two backbone atoms link the ligands; M is Ti, Zr or Hf; each R1 is the same or different and is a linear CMO alkyl group, or linear CHO alkoxy, each n is 0 to 3; each R2 is the same or different and is a C1-10 alkyl group, C1-10 alkoxy group or —Si(R)3 group; each R is the same or different and is C1-10 alkyl or phenyl group optionally substituted by 1 to 3 C1-6 alkyl groups; and eachp is 0 to 3;