Mehrstufiges Ethylenpolymerisationsverfahren

Details

Veröffentlichungs-Nr.

EP4818218

Anmeldetag

31. März 2025

Veröffentlichung

7. Oktober 2026

Rechtsraum

EP

IPC

C08F210/16, C08F4/6592

Abstract

A multistage ethylene polymerisation process for producing ethylene copolymers is described. The process comprises:a) polymerising ethylene in the presence of a solid Ziegler-Natta catalyst component comprising titanium, and a co-catalyst in a first polymerisation stage to produce a first polymer component;b) polymerising ethylene in the presence of the solid Ziegler-Natta catalyst component, the cocatalyst and the first polymer component in a second polymerisation stage to produce a second polymer component;wherein ethylene is polymerised with an alpha-olefin comonomer having from 3 to 10 carbon atoms in the first polymerisation stage and/or the second polymerisation stage; andwherein the first polymerisation stage and/or the second polymerisation stage takes place in the presence of an external donor selected from bi-(oxygen containing ring) compounds of formula (I):in which:n is independently at each occurrence an integer selected from 1 and 2;m is independently at each occurrence an integer selected from 0 and 1;each of R^1a, R^1b, R^2a, R^2b, R^3a, R^3b, R^4a, R^4b, R^5a and R^5b is independently selected from hydrogen, linear or branched C₁ to Cs alkyl, C₃ to Cs alkylene, or wherein two or more of R^1a, R^1b, R^2a, R^2b, R^3a, R^3b, R^4a, R^4b, R^5a and R^5b can form a ring;wherein the two oxygen-containing rings can be individually saturated, partially unsaturated or unsaturated

Anmelder

Firma

Borealis GmbH

Land

🇦🇹 Österreich

Fachgebiete