公开(公告)号：US20150315316A1

公开(公告)日：2015-11-05

申请号：US14652414

申请日：2013-12-20

Applicant: BOREALIS AG

Inventor： Kumudini JAYARATNE ,  Elina HAMALAINE ,  Kalle KALLIO

IPC: C08F210/16

CPC classification number: C08F210/16 ,  C08F210/08 ,  C08F2500/12 ,  C08F210/02 ,  C08F4/6555 ,  C08F4/658 ,  C08F4/651 ,  C08F4/6546

Abstract: Supported Ziegler-Natta ethylene polymerisation procatalyst comprising special bi-(oxygen containing ring) compounds as internal donor, as well as a process for preparing the same and use of such a procatalyst for preparing a catalyst system used in the polymerisation of ethylene for producing high molecular weight polyethylenes.

Abstract translation: 负载的齐格勒 - 纳塔乙烯聚合前催化剂，其包含作为内部给体的特殊的双（含氧环）化合物，以及其制备方法，以及使用这种前催化剂制备用于乙烯聚合生产高分子的催化剂体系 分子量聚乙烯。

公开(公告)号：US20210269560A1

公开(公告)日：2021-09-02

申请号：US17259216

申请日：2019-08-01

Applicant: BOREALIS AG

Inventor： Apostolos KRALLIS ,  Vasileios KANELLOPOULOS ,  Pascal CASTRO ,  Vuokko OJANPERÄ ,  Kumudini JAYARATNE

IPC: C08F4/655 ,  C08F4/654 ,  C08F4/651 ,  C08F4/02 ,  C08F2/00

Abstract: The present invention is concerned with a process for polymerizing ethylene or copolymerizing ethylene and at least one alpha-olefin comonomer in the presence of a supported polymerization catalyst in a multi-stage process in which the last polymerization stage is a gas phase reactor, the use of said process for reducing particle carry-over in the last polymerization stage and the use of a supported polymerization catalyst with a certain median particle size to polymerize an ethylene homo- or copolymer in said multi-stage process with a span of its particle size distribution which can be predicted from the median particle size of the catalyst.