Basell Polyolefine Gmbh

Basell Poliolefine Italia S.r.l.

Ulf Schueller

Gerhardus Meier

Bernd Lothar Marczinke

Shahram Mihan

Pietro Baita

Diana Doetsch

Gabriele Mei

Elke Damm

Claudio Fibla

Andreas Maus

Lorella Marturano

Harilaos Mavridis

Massimo Covezzi

Giuseppe Penzo

Gerd Mannebach

Jens Wiesecke

Giampaolo Pellegatti

Roberta Pica

Harald Schmitz

Peter Bisson

Rainer Sattel

Giampiero Morini

Volker Dolle

Dieter Lilge

Fabiana Fantinel

Antonio Mazzucco

Giulia Mei

Sameer D Mehta

Maria Di Diego

Michael Schiendorfer

Eric D Day

Sebastian Wilhelm

Tiziano Dall'Occo

Dario Liguori

Michael W Lynch

Iakovos Vittorias

Volker Fraaije

Heinz Vogt

Michael J Lynch

Enrico Balestra

Johannes-Friedrich Enderle

Barbara Gall

Antonio Ciarrocchi

Marco Consalvi

Diana Dotsch

Decio Malucelli

Maclovio Herrera Salinas

Gianpiero Ferraro

Diana Dötsch

Antonio De Lucia

Maclovio Salinas Herrera

Shahram Mlhan

A polyethylene composition particularly suited for producing blow-molded hollow articles, having the following features:

Polyethylene composition for blow molding having an improved swell behavior

A process for preparation of an ethylene polymer in a gas-phase polymerization unit comprising a gas-phase polymerization reactor by homopolymerizing ethylene or copolymerizing ethylene and one or more C-C-1-alkenes in a reaction gas made from or containing propane as polymerization diluent in the presence of a pre-activated polymerization catalyst, wherein a purified propane feed stream made from or containing at least 99 mol % propane and from 0.1 to 100 ppm mol propylene is fed to the gas-phase polymerization unit.

Gas-phase process for preparing ethylene polymers

A polyethylene composition for producing blown films, made from or containing an ethylene homopolymer or copolymer A) and an ethylene copolymer B) having a MIE value lower than the MIE value of A), the composition having the following features:

Polyethylene composition for films

A polyethylene composition for producing blow-molded hollow articles, having the following features:

Polyethylene composition having environmental stress cracking resistance

Polethylene composition having high swell ratio

A polyethylene composition for producing blow-molded hollow articles, having the following features: 1) a density from 0.945 to 0.958 g/cm, determined according to ISO 1183 at 23&#xb0; C.; 2) a ratio MIF/MI10 from 2 to 10; 3) a &#x3b7;from 200,000 to 800,000 Pa&#xb7;s; 4) a LCBI equal to or lower than 0.80; and 5) a ratio (&#x3b7;/1000)/LCBI equal to or greater than 350.

Polyethylene composition having high swell ratio, fnct and impact resistance

A process for preparing an ethylene polymer including the step of homopolymerizing ethylene or copolymerizing ethylene with one or more comonomers in a gas-phase polymerization reactor including a riser unit wherein growing polymer particles flow upwards under fluidization, fast fluidization or transport conditions and a downcomer wherein growing polymer particles flow downward in a densified form, wherein the hold-up of polymer particles in the downcomer is from 55 wt. % to 80 wt. % of the total hold-up of polymer particles in the gas-phase polymerization reactor.

Olefin polymerization process in a gas-phase reactor comprising a riser unit and a downcomer

Process for preparing an olefin polymer including the step of polymerizing an olefin in the presence of a polymerization catalyst and hydrogen as molecular weight regulator in a gas-phase polymerization reactor to yield growing polymer particles, the reactor including three or more polymerization zones and at least two thereof are sub-zones of a polymerization unit wherein the growing polymer particles flow downward in a densified form and at least one polymerization zone has a ratio of hydrogen to the sum of olefins which is a factor of at least 1.5 lower than the ratio of hydrogen to the sum of olefins in the polymerization zone having the highest ratio of hydrogen to the sum of olefins and a factor of at least 1.5 higher than the ratio of hydrogen to the sum of olefins in the polymerization zone having the lowest ratio of hydrogen to the sum of olefins.

Olefin polymerization process in a gas-phase reactor having three or more polymerization zones

Polyethylene composition for blow molding having high stress cracking resistance

Polyethylene composition for blow molding having high swell ratio and impact resistance

A process for starting a multizone circulating reactor containing no polyolefin particles, comprising the steps of conveying gas through the reactor and the gas recycle line, feeding a particulate material comprising a polymerization catalyst and optionally polyolefin into the reactor, controlling the gas flow in a vertical reactor zone equipped with a throttling valve at the bottom so that the upwards gas velocity in the bottom part of this reaction zone is lower than the terminal free-fall velocity of the particulate material fed into the reactor, and, after the weight of the particulate polyolefin in this reactor zone is higher than the drag force of the upward moving gas, controlling the circulation rate of the polymer particles within the multizone circulating reactor by adjusting the opening of the throttling valve and adjusting the flow rate of a dosing gas.

Process for start-up of a multizone circulating reactor

The present disclosure relates to a continuous process for the preparation of ethylene homopolymers or ethylene copolymers comprising polymerizing ethylene or copolymerizing ethylene and one or more other olefins in the presence of a chromium catalyst in a gas-phase polymerization reactor which is equipped with a cycle gas line for withdrawing reactor gas from the reactor, leading the reactor gas through a heat-exchanger for cooling and feeding the reactor gas back to the reactor, wherein the polymerization is carried out at a temperature from 30&#xb0; C. to 130&#xb0; C. and a pressure of from 0.1 to 10 MPa and an aliphatic carboxylic acid ester having from 8 to 24 carbon atoms is added.

Continuous gas-phase polymerization processes

A process for the preparation of polyolefins by polymerizing olefins at temperatures of from 20 to 200&#xb0; C. and pressures of from 0.1 to 20 MPa in the presence of a polymerization catalyst and an antistatically acting composition in a polymerization reactor, wherein the antistatically acting composition is a mixture comprising an oil-soluble surfactant and water and the use of an antistatically acting composition comprising an oil-soluble surfactant and water as antistatic agent for the polymerization of olefins at temperatures of from 20 to 200&#xb0; C. and pressures of from 0.1 to 20 MPa in the presence of a polymerization catalyst.

Polymerization process in the presence of an antistatic composition

Growing community of inventors

Weiterstadt, Germany

Ulf Schueller