公开(公告)号：US20220220231A1

公开(公告)日：2022-07-14

申请号：US17614744

申请日：2020-05-20

Applicant: BOREALIS AG

Inventor： Luigi Maria Cristoforo RESCONI ,  Wilfried TOELTSCH ,  Ville VIRKKUNEN ,  Kalle KALLIO ,  Soile LUSTIG ,  Noureddine AJELLAL ,  Marja MUSTONEN ,  Alexander REZNICHENKO

IPC: C08F4/6592 ,  C08F4/649 ,  C08F4/659 ,  C08F10/06

Abstract: New, improved silica supported catalyst system, which comprises a specific class of metallocene complexes in combination with a boron containing cocatalyst and an aluminoxane cocatalyst, its use for producing propylene homopolymers, propylene copolymers, especially with ethylene, as well as heterophasic propylene copolymers, preferably in a multistep process including a gas phase polymerization step.