Borealis Ag

Borealis Gmbh

Ismo Lehtiniemi

Ville Virkkunen

Luigi Resconi

Alexander Z Voskoboynikov

Peter Denifl

Kalle Kallio

Noureddine Ajellal

Pascal Castro

Marja Mustonen

Lauri Huhtanen

John Severn

Anu-Leena Hongell

Vyatcheslav V Izmer

Dmitry S Kononovich

Sameer Vijay

Simon Schwarzenberger

Wilfried Peter Toltsch

Pertti Elo

Mikko Lylykangas

Luigi Maria Cristoforo Resconi

Kimmo Hakala

Soile Rautio

Pasi Matikainen

Tom Elovirta

Wilfried Toeltsch

Wilfried Töltsch

Dimitry S Kononovich

Erik Mansner

Jyrki Kauhanen

Michael Bartke

Jari HÄTÖNEN

Jeanette Aumo

Jukka Räsänen

Claimed are metallocene-complexes of formula (I) [formula (I')] wherein M is Hf or Zr, L is a bridge comprising 1-2 C- or Si-atoms, The other variables are as defined in the claims.

Catalysts

Process for producing a heterophasic propylene copolymer using a specific class of metallocene complexes in a multistage polymerization process including a gas phase polymerization step. The invention further relates to the use of catalysts which comprise a specific class of metallocene complexes to produce a heterophasic propylene copolymer in a multistep process including a gas phase polymerization step.

Process for preparing heterophasic propylene copolymers

A catalyst comprising (i) a metallocene complex of a group (IV) metal said metallocene comprising at least two cyclopentadienyl type ligands; (ii) a boron cocatalyst; and (iii) an aluminoxane cocatalyst; said catalyst being in solid form, preferably in solid particulate form, and being free from an external carrier.

Catalyst

A process for the polymerization of at least one olefin comprising reacting said at least one olefin with a catalyst comprising: (i) a metallocene complex said metallocene comprising at least two cyclopentadienyl type ligands; (ii) a boron cocatalyst; and (iii) an aluminoxane cocatalyst; said catalyst being in solid form, preferably in solid particulate form, and being free from an external carrier.

Polymerisation process and catalyst

The present application aims to provide a process for producing a solid polymerization catalyst component, including the steps of (A) producing a solution with a transition metal compound and a solvent; (B) solidifying a component with the transition metal compound to produce the solid polymerization catalyst component in a solidification stage; (C) recovering from the solidification stage a liquid stream containing a minor amount of the transition metal compound dissolved therein and a solid catalyst stream; and (D) recovering the transition metal component from the liquid stream, characterized in that step (D) may include concentrating the solution to produce a first product stream including the solvent and being essentially free of the transition metal compound and a second product stream including the solvent and the transition metal compound, characterized in that the concentration is conducted within a temperature range of from 0 to 100 degrees Celsius.

Process for recovering a transition metal compound

Growing community of inventors

Kellokoski, Finland

Ismo Lehtiniemi