Basell Polyolefine Gmbh

Basf Aktiengesellschaft

Other

Basell Poliolefine Italia S.r.l.

Elenac Gmbh

Babell Polyolfine Gmbh

Rainer Karer

Shahram Mihan

Manfred Hecker

Philipp Rosendorfer

Dieter Lilge

Kaspar Evertz

Jennifer Kipke

Hans-Jacob Feindt

Wolfgang Micklitz

Peter Bauer

Paulus De Lange

Martin Schneider

Harald Schmitz

Armin Lange

Guido Funk

Peter Kölle

Günther Schweier

Cyrus Ahmadzade-Youssefi

Martin Lux

Joachim Wulff-Döring

Volker Rauschenberger

Klaus Berhalter

Paulus-Petrus Maria De Lange

Ulrich Nieken

Eberhard Herrmann

Jörg Halpap

Gerhardus Meier

Volker Warzelhan

Wolfgang Rohde

Gabriele Mei

Pietro Baita

Fabiana Fantinel

Giuseppe Penzo

Volker Fraaije

Gerd Mannebach

G&uuml;nther Schweier

Heinz Vogt

Robert Bachl

Jens Wiesecke

Stephan H&uuml;ffer

Jörg Auffermann

Axel Hamann

Michael Olmscheid

Lutz-Gerd Heinicke

Peter Eck

Axel Sperber

Klaus Foettinger

Lothar Berger

Alexander Köppl

Holger Strecker

Rosendorfer Philipp

Christoph Kiener

Klaus Föttinger

Kasper Evertz

Klaus F&ouml;ttinger

Adrian Popa

Monomodal copolymers of ethylene and molding compositions comprising such copolymers, wherein the copolymers have a density determined according to DIN EN ISO 1183-1, variant A in the range from 0.938 to 0.944 g/cm, a melt index MFRdetermined according to ISO 1133 at 190&#xb0; C. under a load of 21.6 kg in the range from 12 to 17 g/10 min, a weight average molar mass Min the range from 140 000 g/mol to 330 000 g/mol, a polydispersity M/Min the range from 9 to 17, and a content of comonomer side chains per 1000 carbon atoms Cequal to or above a value defined via equation (I) C=128.7&#x2212;134.62&#xd7;d', wherein d&#x2032; is the numerical value of the density of the copolymer in g/cm, the use of the copolymers for producing injection-molded articles, as well as injection-molded articles comprising the copolymers, and process for the preparation of such monomodal copolymers.

Monomodal copolymer of ethylene for injection molding and process for its preparation

A method for controlling the temperature in a polymerization reactor equipped with a cycle gas line for withdrawing reactor gas from the reactor, leading the reactor gas through a heat-exchanger, which is cooled by a cooling medium, which is conveyed in a cooling system through the heat-exchanger, and feeding the reactor gas back to the reactor by adjusting the temperature of the cooling medium entering the heat exchanger, wherein the temperature of the cooling medium entering the heat exchanger is controlled by adjusting the flow rate of the cooling medium in a part of the cooling system by a flow control system comprising two continuously operating flow control devices of different size, which are connected in parallel, a process for polymerizing olefins and a process for controlling the flow rate of a fluid medium.

Method for cooling a gas-phase reactor for the polymerization of olefins

The instant invention relates to an activation of a polymerization catalyst precursor by heat treatment comprising a support material and a catalyst precursor deposited thereon in a fluidized bed activator and to the use of the activated polymerization catalyst in the manufacture of polyolefins. The activation involves heat treatment in the presence of oxygen. After that activation the oxygen in the activator is replaced by inert gas via flushing until the fluidization gas emerging from the activator comprises oxygen in a maximum amount of up to 5 ppm. The catalyst prepared by that method is improved with respect to prevent reactor fouling during gas-phase polymerization or slurry polymerization either in stirred vessel or loop.

Method for activation of chromium containing catalyst precursor for polymerization and the resulting polymerization catalyst

A polyethylene composition, in particular suitable for the preparation of films, and a process for preparing the same are described. The polyethylene composition of the invention comprises from 50 to 89% by weight of a first polyethylene component comprising at least one multimodal polyethylene including a plurality of ethylene polymer fractions having distinct molecular weights and comonomer contents, at least one of said plurality of ethylene polymer fractions being prepared by the use of a single site catalyst, and from 50 to 11% by weight of a second polyethylene component comprising a low or medium density polyethylene.

Polyethylene composition suitable for the preparation of films and process for preparing the same

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

Polyethylene for injection moldings

A process for continuously mixing at least two fluid streams and splitting the stream of the mixture into at least two partial streams, comprising a) providing streams of the at least two fluids via separated conduits; b) combining the streams of the fluids and forming a homogeneous mixture; c) measuring the pressure in the conduit conveying the mixture of the fluids; d) splitting the stream of the mixture of the fluids into at least two partial streams and feeding each of the partial streams to a conduit equipped with a flow control device controlled by a controller; and e) adjusting the flow rates of the partial streams of the mixture of the fluids by feeding the pressure information measured in step c) as process variable to the controllers controlling the flow control devices, a process for feeding a mixture of at least two fluids via at least two feeding points, an apparatuses for carrying out such processes and a process for polymerizing olefins.

Process and apparatus for mixing and splitting fluid streams

The invention refers to a process for preparing a supported catalyst system for the polymerization of olefins comprising at least one active catalyst component on a support, the process comprising A) impregnating a dry porous support component with a mixture comprising at least one precatalyst, at least one cocatalyst, and a first solvent, such that the total volume of the mixture is from 0.8 to 2.0 times the total pore volume of the support component, andB) thereafter, adding a second solvent in an amount of more than 1.5 times the total pore volume of the support component. The invention refers further to a catalyst system made by this process and the use of this catalyst system for polymerization or copolymerization of olefins.

Process for preparing a supported catalyst system for olefin polymerization, the catalyst system and its use

A multimodal polyethylene composition comprising at least three ethylene polymer fractions having distinct molecular weights or comonomer contents, the at least three ethylene polymer fractions comprising at least one first ethylene polymer fraction having a first molecular weight, at least one second ethylene polymer fraction having a second molecular weight higher than the first molecular weight, and at least one third ethylene polymer fraction having a third molecular weight higher than the first molecular weight, wherein the at least one first ethylene polymer fraction and the at least third ethylene polymer fraction are prepared by the use of a first and, respectively, third catalyst of the single site type.

Multimodal polyethylene composition, mixed catalyst and process for preparing the composition

Catalysts suitable for preparation of a polyethylene which comprises ethylene homopolymers and/or copolymers of ethylene with 1-alkenes and has a molar mass distribution width M/Mof from 5 to 30, a density of from 0.92 to 0.955 g/cm, a weight average molar mass Mof from 50000 g/mol to 500 000 g/mol and has from 0.01 to 20 branches/1000 carbon atoms and a z-average molar mass Mof less than 1 million g/mol.

Catalyst composition for preparation of polyethylene

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 polyethylene which comprises ethylene homopolymers and/or copolymers of ethylene with 1-alkenes and has a molar mass distribution width M/Mof from 5 to 30, a density of from 0.92 to 0.955 g/cm, a weight average molar mass Mof from 50000 g/mol to 500 000 g/mol and has from 0.01 to 20 branches/1000 carbon atoms and a z-average molar mass Mof less than 1 million g/mol.

Process for preparing ethylene copolymers

Monomodal molding compositions based on polymers of ethylene, wherein the density of the molding compositions is in the range from 0.940 to 0.96 g/cm, the Mi is in the range from 0.5 to 10.0 g/10 min. the polydispersity M/Mis in the range from 3 to 20, the branches/1000 carbon atoms is in the range from 0.1 to 10 and the weight average molar mass Mis in the range from 50 000 g/mol to 150 000 g/mol, and also injection-molded shaped bodies as well as screw closures comprising the molding compositions.

Polyethylene molding compositions for injection molding applications

Gas-phase fluidized-bed reactor for polymerizing ethylenically unsaturated monomers, comprising a reactor chamber () in the form of a vertical tube, if desired a calming zone () following the upper section of the reactor chamber, a circulation gas line (), a circulation gas compressor () and a cooling device (), where, in the region of transition of the reaction gas from the circulation gas line into the reactor chamber and in the lower section of the reactor chamber itself, there is either no gas distributor plate at all or only a gas distributor plate the total surface area of whose gas orifices is more than 20% of the total surface area of said gas distributor plate.

Gaseous phase fluidized-bed reactor

Process for preparation of ethylene homopolymers or copolymers, comprising the steps of a) polymerization of ethylene or of ethylene with one or more other 1-olefins in the presence of a chromium catalyst at temperatures of from 20 to 200&#xb0; C. and at pressures of from 0.1 to 20 MPa, where the chromium catalyst can be prepared via application of one or more chromium compounds to a silicate support and subsequent thermal activation under oxidative conditions at temperatures of from 620 to 900&#xb0; C.; b) mixing of the polyethylene in the melt in the presence of from 1000 to 2000 ppm of an antioxidant comprising at least one sterically hindered phenol and comprising at least one phosphite in a mixing ratio of from 1:5 to 5:1, with specific energy input of at least 0.17 kWh/kg.

Process for preparation of ethylene polymers for blown films

A polyethylene which comprises ethylene homopolymers and/or copolymers of ethylene with 1-alkenes and has a molar mass distribution width M/Mof from 5 to 30, a density of from 0.92 to 0.955 g/cm, a weight average molar mass Mof from 50000 g/mol to 500 000 g/mol and has from 0.01 to 20 branches/1000 carbon atoms and a z-average molar mass Mof less than 1 million g/mol, a process for its preparation, catalysts suitable for its preparation and also films in which this polyethylene is present.

Polyethylene and catalyst composition for its preparation

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Kaiserslautern, Germany

Rainer Karer