Basell Polyolefine Gmbh

Lars Kölling

Shahram Mihan

Benno Bildstein

Alexander Solchinger

Lenka Lukesova

Sascha Schlawjinski

The instant invention pertains to a process for preparing an ethylene homo- or copolymer in the presence of a supported chromium catalyst by slurry loop polymerization or copolymerization, whereby the resulting polymer powder has an increased powder density, in which the supported chromium catalyst has a chromium content of from 0.01 to 5 wt.-%, based on the element in the finished catalyst, and shows a particle size distribution measured according to ISO 13320-2009 comprising two main fractions one of which having a dof from 15 to 40 &#x3bc;m and the other having a dof from 45 to 80 &#x3bc;m said catalyst being further characterized by the fact that less than 10% wt of its catalyst particles has diameter lower than 20 &#x3bc;m.

Process for preparing olefin polymer by slurry loop polymerization having high powder density

A novel UHMW polyethylene material, which is displaying excellent abrasion resistance amongst other properties, is devised.

Ultra-high molecular weight polyethylene

Process for the preparation of monoimine compounds, wherein a dicarbonyl compound is reacted in an aliphatic, non-aromatic solvent with aniline. Monoimine compounds having electron-withdrawing substituents in the ortho position and unsymmetric bis(imino) compounds and unsymmetric iron complexes prepared therefrom and the use thereof in the polymerization of olefins.

Process for the preparation of unsymmetric bis(imino) compounds

The present invention relates to transition metal compounds of the formula (I), a process for preparing polyolefins by polymerization or copolymerization of at least one olefin in the presence of at least one olefin in the presence of at least one of the catalyst systems according to the invention and the use of the ligand systems according to the invention for preparing transition metal compounds.

Transition metal compound, ligand system, catalyst system and process for preparing polyolefins

Process for preparing imine compounds, in which a carbonyl compound is reacted with a primary amine. The imine compound obtained in this way can be reacted further with a metalalkyl and subsequently a carbonyl compound to form an imine compound.

Process for preparing imino compounds

Process for preparing diimine compounds, in which a discarbonyl compound is reacted with primary amines in the presence of phosphorus pentoxide.

Process for preparing diimine compounds

A process for the racemoselective preparation of ansa-metallocene complexes of the formula (I), where

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Mannheim, Germany

Lars Kölling