Basf Aktiengesellschaft

Basell Polyolefine Gmbh

Basell Poliolefine Italia S.r.l.

Guido Funk

Roland Saive

Rainer Konrad

Rainer Hemmerich

Robert Bachl

Siegfried Weber

Kaspar Evertz

Paulus De Lange

Martin Lux

Hans Gropper

Erich Kolk

Hans-Joachim Mueller

Shahram Mihan

Andreas Deckers

Wolfgang Rohde

Rainer Karer

Hans-Helmut Goertz

Peter K&ouml;lle

Andreas Haufe

Ingo Treffkorn

Godofredo Follmer

Volker Warzelhan

Peter Bauer

Juergen Schmidt-Thuemmes

Joachim Wulff-Döring

Rudolf Mueller-Mall

Peter Kölle

Dieter Oeder

Gerhardus Meier

Dieter Lilge

Gabriele Mei

Pietro Baita

Guenther Schweier

Juergen Kerth

Manfred Hecker

Gerd Mannebach

Harald Schmitz

Martin Laun

Peter Hennenberger

Peter Koelle

Wolfgang Ball

Hans-Helmut G&ouml;rtz

Konrad Richter

Anke Bold

Neil Nadalin

Christoph Kiener

Adrian Popa

Rolf Osterloh

A polyethylene for IM having excellent processing properties in terms of spiral flow testing is devised.

Polyethylene for injection moldings

A process for introducing a catalyst powder based on a titanium compound supported on magnesium halide into a gas-phase olefin polymerization reactor, characterized in that it comprises:

Process for feeding a catalyst in a polymerization reactor

A process for preparing supported, titanized chromium catalysts is disclosed. The process comprises A) bringing a support material into contact with a protic medium comprising a titanium compound and a chromium compound; B) optionally removing the solvent; C) optionally calcining the precatalyst obtained after step B); and D) optionally activating the precatalyst obtained after step B) or C) in an oxygen-containing atmosphere at from 400&#xb0; C. to 1100&#xb0; C.

Supported chromium catalyst and its use for preparing homopolymers and copolymers of ethylene

Catalyst for the polymerization and/or copolymerization of olefins which is obtainable by application to a finely divided inorganic support and concluding calcination at temperatures of from 350 to 1050&#xb0; C. and has a chromium content of from 0.1 to 5% by weight and a zirconium content of from 0.5 to 10% by weight, in each case based on the element in the finished catalyst, with the molar ratio of zirconium to chromium being from 0.6 to 5.

Catalyst comprising chromium and zirconium for the polymerization and/or copolymerization of olefins

Process for preparing a supported catalyst for the polymerization and/or copolymerization of olefins which has a chromium content of from 0.01 to 5% by weight, based on the element, which comprises

Process for preparing a chromium-based catalyst for the polymerization and/or copolymerization of olefins

The invention relates to a process for preparing an essentially spherical support for olefin polymerization catalysts, which comprises the steps: preparation of a hydrogel comprising a cogel of silicon oxide and at least one further metal oxide, if appropriate, washing of the hydrogel until the content of alkali metal ions is less than 0.1% by weight, based on the weight of solids, extraction of the water from the hydrogel until the water content is less than 5% by weight, based on the total content of liquid, and drying of the hydrogel to form a xerogel. According to the invention, the extraction step comprises at least one first extraction with a first organic solvent which is at least partially miscible with water down to a water content of 50% by weight, followed by at least one second extraction with a second organic solvent which is at least partially miscible with water.

Process for preparing a support for olefin polymerization catalysts

In a process for producing Phillips catalysts in which an oxidic support material is treated in suspension with a chromium salt solution and subsequently, after removing the solvent, calcined in an oxygen-containing atmosphere at above 300&deg; C., the oxidic support material and/or the catalyst after calcination are/is, according to the present invention, comminuted until a mean particle size of <100 &mgr;m has been reached and the proportion of particles having a size of <50 &mgr;m is at least 30%, preferably in the range from 40 to 80%. A process for preparing homopolymers or copolymers of ethene in a loop reactor at from 30 to 150&deg; C. under a pressure in the range from 0.2 to 15 MPa in the presence of a catalyst produced by the process of the present invention is also provided.

Method for producing Phillips catalysts for polymerizing olefins with better productivity rates in the particle-form process

Optimized method for the production of catalyst supports based on silica gel and chromium catalysts supported on silica gel

The invention relates to a method for producing supported chromium catalysts for the polymerisation of olefins by loading a xerogel support with chromium by adding to the xerogel support a volume of a 0.025 to 15% by weight solution of a chromium compound or a volume of a solution comprising from 0.025 to 7.8% by weight of Cr which is essentially converted into a chromium(VI) compound on heating in a water-free stream of gas under oxidizing conditions at temperatures in the range from 300 to 1100&deg; C. for a period of from 10 to 1000 minutes in a solvent which comprises a maximum of 20% by weight of water, and subsequently evaporating the solvent, where the volume of the chromium salt solution employed is smaller than the pore volume of the xerogel support.

Method for producing supported chrome catalysts and the use thereof for the polymerization of olefins

A process for preparing stabilized olefin polymers which have a low cold heptane extractables content by polymerization of olefins with Ziegler or Phillips catalysts, wherein the polymer is, immediately after leaving the polymerization reactor, brought into contact with an involatile phenol derivative.

Preparation of polyolefins with low extractables contents

In a low-odor polyethylene blend made from a high-molecular-weight ethylene copolymer obtainable by polymerization in the presence of a Ziegler catalyst and from a low-molecular-weight ethylene homopolymer or ethylene copolymer obtainable by polymerization in the presence of a chromocene catalyst on an oxidic support, the Al content of the high-molecular-weight component is from 5 to 60 mg/kg, the Al content of the low-molecular-weight component is from 0 to 5 mg/kg and the Al content of the blend is from 1 to 55 mg/kg. Processes are described for preparing blends of this type. Their use is described for producing moldings, in particular hollow articles and pipes. Moldings, in particular hollow articles and pipes, are produced from low-odor polyethylene blends.

Low-odor polyethylene blends

The present invention relates to high molecular weight homopolymers and copolymers of ethene, which homopolymer or copolymer is obtained by polymerizing the monomer(s) at a temperature of from 70.degree. to 150.degree. C. and under a pressure of from 2 to 150 bar in contact witha chromium trioxide catalyst,

High molecular weight homopolymers and copolymers of ethene

A process for the preparation of a supported catalyst for the polymerization of .alpha.-olefins, in which

Preparation of a supported catalyst for the polymerization of

A novel Phillips catalyst for the copolymerization of ethylene with .alpha.-olefins, contains, as a catalytically active component, a finely divided, aluminum silicate-supported, phosphorus-containing chromium catalyst. This can be prepared by applying at least one organic phosphorus(III), (IV) and/or (V) compound and at least one chromium(III) compound which does not react with said phosphorus compounds under the reaction conditions used, in succcession in any order or simultaneously, to a finely divided aluminum silicate hydrogel or xerogel with formation of a catalyst intermediate and activating the catalyst intermediate at elevated temperatures in an oxidizing atmosphere, with the result that the chromium catalyst is formed. The novel Phillips catalyst gives ethylene/.alpha.-olefin copolymers in which the comonomers are more uniformly distributed over the copolymer chains than is the case with ethylene/.alpha.-olefin copolymers which have been prepared with the aid of conventional Phillips catalysts. Moldings which have been produced from the ethylene/.alpha.-olefin copolymers obtained in the novel procedure have a particularly high environmental stress cracking resistance and an excellent creep rupture strength.

Phillips catalyst and its use for the preparation of

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Worms, Germany

Guido Funk