Abstract: 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 d50 of from 15 to 40 ?m and the other having a d50 of from 45 to 80 ?m said catalyst being further characterized by the fact that less than 10% wt of its catalyst particles has diameter lower than 20 ?m.

Abstract: 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 d50 of from 15 to 40 ?m and the other having a d50 of from 45 to 80 ?m said catalyst being further characterized by the fact that less than 10% wt of its catalyst particles has diameter lower than 20 ?m.

Abstract: 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.

Abstract: 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.

Abstract: A process for the racemoselective preparation of ansa-metallocene complexes of the formula (I), where R1, R1?, R2, R2? are identical or different and are each hydrogen or an organic radical having from 1 to 40 carbon atoms, R3, R3? are identical or different and are each an organic radical having from 1 to 40 carbon atoms, T, T? are identical or different and are each a divalent organic group which has from 1 to 40 carbon atoms, A is a divalent atom or a divalent group, Z is a divalent atom or a divalent group, E is P, As or Sb, M1 is an element of group 4 of the Periodic Table of the Elements, M2 is an alkali metal, an alkaline earth metal or a magnesium monohalide fragment, p is 1 or 2.

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