公开(公告)号：US20240002555A1

公开(公告)日：2024-01-04

申请号：US18253143

申请日：2021-11-23

Applicant: BOREALIS AG

Inventor： Jingbo Wang ,  Markus Gahleitner ,  Klaus Bernreitner ,  Pauli Leskinen ,  Emilia Tiitinen

IPC: C08F10/06 ,  C08L23/14

CPC classification number: C08F10/06 ,  C08L23/142 ,  C08L2205/025 ,  C08L2205/24 ,  C08L2308/00 ,  C08L2314/02 ,  C08L2314/06 ,  C08L2205/035

Abstract: A process for the preparation of isotactic propylene polymer compositions involving the polymerisation of propylene and optionally one or more comonomers selected from ethylene and α-olefins containing 4 to 12 carbon atoms in one or more reaction steps in the present of a catalyst system comprising 45 to 99 wt.-% of a metallocene catalyst and 1 to 55 wt.-% of a Ziegler Natta catalyst having a non-phthalate internal donor and having been prepolymerised with a monomer (I) of the general formula CH2═CH—CHR1R2 (I) wherein R1 and R2 are either individual alkyl groups with one or more carbon atoms or form an optionally substituted saturated, unsaturated or aromatic ring or a fused ring system containing 4 to 20 carbon atoms.

公开(公告)号：US20240409673A1

公开(公告)日：2024-12-12

申请号：US18699374

申请日：2022-10-13

Applicant: Borealis AG

Inventor： Kumudini Jayaratne ,  Hanna- Leena Rönkkö ,  Pavel Shutov ,  Joana Elvira Kettner ,  Jukka-Pekka Parjanen ,  Emilia Tiitinen

IPC: C08F10/06

Abstract: A process for forming a Ziegler-Natta catalyst component, wherein a certain combination of washing steps is employed, enabling the provision of inventive catalysts capable of synthesising polypropylenes with increased melting temperature, decreased XCS content, as well as more efficiently maintaining catalyst activity across sequential polymerization processes.