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

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

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: 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.

Abstract: Catalyst system for olefin polymerization comprising (a) at least one phenanthroline-comprising iron complex, (b) an organic or inorganic support, (c) optionally one or more activators, (d) optionally one or more metal compounds of group 1, 2 or 13 of the Periodic Table and (e) optionally further catalysts suitable for olefin polymerization, and also their use in the polymerization of olefins.

Abstract: Phenanthroline-comprising complexes and catalyst systems obtained therefrom, and also their use 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 multimodal polyethylene having an inverse comonomer distribution, as well as a process carried out in a single reactor in the presence of a mixed catalyst composition comprising two different polymerization catalysts, are described. The multimodal polyethylene has a density of 0 915-0 970 g/cm3, a weight average molar mass Mw of 100 000-900 000 g/mol, and a polydispersity Mw/Mn, of at least 15. The at least one homopolymer has a density of 0 950-0 975 g/cm3, a weight average molar mass Mw of 10 000-90 000 g/mol and a polydispersity Mw/Mn, higher than 3 and lower than 10, and the at least one copolymer has a polydispersity Mw/Mn between 8 and 80.

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

Abstract: The present invention relates to transition metal compounds of the formula (I); where M is an element of group 3, 4, 5, 6, 7, 8, 9 or 10 of the Periodic Table of the Elements or the lanthanide's, the radicals X are identical or different and are each an organic or inorganic radical, with two radicals X also being able to be joined to one another to form a divalent radical, is 1, 2, 3 or 4, L1 is an organic or inorganic uncharged ligand, is an integer from 0 to 4, R1 is an organic radical having from 1 to 40 carbon atoms, R2 is hydrogen or an organic radical having from 1 to 40 carbon atoms, or R1 and R2 together form a divalent organic group T1 which has from 2 to 40 carbon atoms and together with the atoms connecting its ends forms a monocyclic or polycyclic ring system which may in turn be substituted and may comprise one or more further heteroatoms selected from the group consisting of the elements O, S, Se, Te, N, P and As in the ring system, R3 is hydrogen or an organic radical having from 1 to 40 carbon

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: 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.