Hoechst Aktiengesellschaft

Basell Polyolefine Gmbh

Targor Gmbh

Hoechst Gmbh

Basell Poliolefine Italia S.r.l.

Basell Poliolefine Italia, S.p.a.

Basell Polypropylen Gmbh

Hoechst Aktiengellschaft

Tagor Gmbh

Bassel Polylefine Gmbh

Ofelia Fusco

Gianni Collina

Eduardo Chicote Carrion

Alberto Gil

Karl Heinz Kagerbauer

Volker Dolle

Andreas Winter

Walter Spaleck

Martin Antberg

Jurgen Rohrmann

J&uuml;rgen Rohrmann

Frank Kuber

Gerhardus Meier

Dieter Lilge

Bernd Lothar Marczinke

Bernd Bachmann

Iakovos Vittorias

Ulf Schüller

Jens Wiesecke

Barbara Gall

Johannes-Friedrich Enderle

Michael Schreck

Shahram Mihan

Wolfgang Anton Herrmann

Lothar Bothe

Fabiana Fantinel

Thomas Wilhelm

Herbert Riepl

Franz Langhauser

Hans-Friedrich Herrmann

Ulf Schueller

Herbert Terwyen

Robert Klein

Jürgen Rohrmann

Ulf Schuller

Frank Kueber

Juergen Rohrmann

Hartmut Kondoch

Bernd L Marczinke

Volker Fraaije

Gerd Mannebach

Elke Damm

Ludwig Bohm

Andreas Maus

Reinhard Kuehl

Frank K&uuml;ber

Peter Rohrbach

Thomas Boehm

Horst Klassen

Thomas Bohm

J Urgen Rohrmann

Hermann Gebhart

Herbert Plötz

Karl-Heinz Kagerbauer

Paul-Richard Sch&ouml;neborn

Elisabeth Glattki-Mayer, Legal Representative

Angel Sanchez

Peter Götz

Thomas Böhm

Eduardo Enrique Chicote

Frank Küber

Ulf SCHÜLLER

A process for preparing an ethylene polymer in a suspension polymerization including the steps of separating the formed suspension of ethylene polymer particles in a solid-liquid separator into ethylene polymer particles and mother liquor, transferring a first part of the mother liquor into a work-up section including an evaporation unit for producing a wax-depleted portion of the mother liquor, wherein a protic agent is added to the part of the mother liquor which is transferred into the work-up section, and recycling a first part of the wax-depleted portion of the mother liquor to the polymerization reactor or the series of polymerization reactors.

Suspension process for preparing ethylene polymers comprising workup of the suspension medium

The present disclosure relates to a polyethylene composition with improved swell ratio and mechanical properties for use in preparing blow-molded articles and having the following features:

Polyethylene processes for producing compositions having high swell ratio

The present disclosure relates to a polyethylene composition with improved swell ratio and mechanical properties for use in preparing blow-moulded articles and having the following features:

Polyethylene composition having high swell ratio

The present disclosure relates to a polyethylene composition with improved swell ratio and mechanical properties, particularly suited for preparing blow-moulded articles, said composition having the following features:

Polyethylene composition with improved balance of environmental stress cracking resistance (FNCT) and impact resistance (Charpy), particularly suited for preparing pipes, said composition having the following features:

Polyethylene composition having high mechanical properties

Polyethylene composition with improved swell ratio and mechanical properties, particularly suited for preparing blow-molded articles, said composition having the following features: 1) density from 0.945 to less than 0.952 g/cm; 2) ratio MIF/MIP from 15 to 30; 3) Shear-Induced Crystallization Index SIC from 2.5 to 5.5.

Polyethylene composition with improved swell ratio and mechanical properties, particularly suited for preparing blow-moulded articles, said composition having the following features:

A multimodal ethylene copolymer having the following properties:

Polyethylene Copolymers

An ethylene copolymer, a catalyst system suitable to prepare the ethylene copolymer, and a process to prepare such ethylene copolymer are described. The use of the ethylene copolymer as impact modifier in polyethylene and as compatibilizer in a polymer blend are also described. The ethylene copolymer has a density from 0.855 g/cmto 0.910 g/cm, a polydispersity M/Mlower than 3.5, comprises at least one first ethylene polymer component and at least one second ethylene polymer component having different comonomer contents so as to show at least two predetermined CRYSTAF peak temperatures.

Ethylene copolymers, catalyst system and process for preparing the same

To meter catalysts into a reactor, the catalyst is firstly suspended in a hydrocarbon in a reservoir and the suspension obtained is kept in motion by stirring and then fed via a three-way metering valve and an ejector into the actual reactor, wherein the suspension containing the catalyst is firstly discharged from the reservoir by means of a pump and continuously circulated by returning the suspension via the three-way metering valve within a closed piping system to the reservoir, subsequently setting a pressure in the reservoir which is from 0.1 to 30 bar higher than the pressure in the reactor and then continuously introducing the suspension into the reactor via a flow meter which controls the three-way metering valve and via a downstream ejector by pulse operation of the now open three-way metering valve.

Metering of catalysts

Molding compositions made from a high-molecular-weight propylene polymer with a melt mass-flow rate MFR of from 0.3 to 1 g/10 min, to ISO 1133 at 230&#xb0; C. and 5 kg, and with a proportion of &#x3b2; modification crystallites in the range from 2 to 20% by weight. The molding compositions of the invention preferably comprise a quinarcidone pigment as nucleating agent. The high-molecular-weight propylene polymer used preferably comprises a high-molecular-weight propylene copolymer with up to 30% by weight of other copolymerized olefins having up to 10 carbon atoms. One of the uses of the molding compositions of the invention is as materials for pipes.

Molding compositions made from a high-molecular-weight-propylene polymer

The novel metallocenes of the formula Iin which, preferably, Mis Zr or Hf, Rand Rare alkyl or halogen, Rand Rare hydrogen, Rand Rare alkyl or haloalkyl, &#x2014;(CRR)&#x2014;R&#x2014;(CRR)&#x2014; is a single- or multi-membered chain in which Rmay also be a (substituted) hetero atom, m+n is zero or 1, and Ris hydrogen, form, together with aluminoxanes as cocatalysts, a very effective catalyst system for the preparation of polyolefins of high stereospecificity and high melting point.

Metallocenes containing ligands of 2-substituted indenyl derivatives, process for their preparation, and their use as catalysts

Process for the polymerization of olefins CH&#x2550;CHR, in which R is hydrogen or a hydrocarbon radical with 1&#x2013;12 carbon atoms, carried out in the presence of a catalyst component (A) comprising Mg, Ti and halogen as essential elements and of a catalyst component (B) capable to produce, under the same polymerization conditions, a polymer with an average particle size lower than that obtainable with the said catalyst component A. The said process provides polymers with increased bulk density.

Process for the polymerization of olefins

A process for the preparation of an olefin polymer by polymerization or copolymerization of an olefin of the formula R&#x2014;CH&#x2550;CH&#x2014;R, in which Rand Rare identical or different and are a hydrogen atom or a hydrocarbon radical having 1 to 14 carbon atoms or Rand R, together with the atoms connecting them, can form a ring, at a temperature of from &#x2212;60&#xb0; to 200&#xb0; C., at a pressure of from 0.5 to 100 bar, in solution, in suspension or in the gas phase, in the presence of a catalyst formed from a metallocene in the meso-form or a meso:rac mixture, with meso:rac&#x3e;1:99, as transition-metal compound and a cocatalyst, wherein the metallocene is a compound of the formula I,in which Mis Zr or Hf, Rand Rare identical or different and are methyl or chlorine, Rand Rare identical or different and are methyl, isopropyl, phenyl, ethyl or trifluoromethyl, Rand Rare hydrogen or as defined for Rand R, or Rforms an aliphatic or aromatic ring with R, or adjacent radicals Rform a ring of this type, and Ris aradical, and m plus n is zero or 1.

Process for the preparation of polyolefins

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Bensheim, Germany

Volker Dolle