Basell Poliolefine Italia S.r.l.

Basell Polyolefine Gmbh

Lorella Marturano

Pietro Baita

Gabriele Mei

Gerhardus Meier

Ulf Schueller

Maria Di Diego

Giampiero Morini

Massimo Covezzi

Roberta Pica

Antonio Mazzucco

Gianni Collina

Tiziano Dall'Occo

Dario Liguori

Benedetta Gaddi

Andreas Maus

Shahram Mihan

Bernd Lothar Marczinke

Diego Brita

Anna Fait

Gerd Mannebach

Daniele Evangelisti

Enrico Balestra

Piero Gessi

Harry Mavridis

A catalyst component made from or containing Ti, Mg, chlorine, an amount of a first internal donor selected from esters of aliphatic monocarboxylic acids (EAA), and an amount of a second internal donor selected from cyclic ethers (CE), wherein the EAA/CE molar ratio ranges from 0.02 to less than 20.

Catalyst components for the polymerization of olefins and catalysts therefrom obtained

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

A gas-phase process for the homopolymerization or copolymerization of olefins carried out in the presence of a catalyst system formed by a contacting, in a liquid hydrocarbon and in the presence of hydrogen, (a) a solid catalyst component comprising Ti, Mg, and Cl, and optionally an internal electron donor compound, (b) an aluminum alkyl compound and optionally (c) an external donor compound.

Process for the polymerization of olefins

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 provides a gas-phase polymerization process for preparing polyethylene, wherein halogenated alcohols in combination with a Ti based catalyst component and aluminum alkyls as co-catalyst suppress ethane formation or increase polymerization activity.

Process for the polymerization of ethylene

The present disclosure provides a catalyst system made from or containing: (A) a solid catalyst component made from or containing (i) a titanium compound supported on a magnesium dichloride; (B) an aluminum alkyl compound; and (C) a halogenated organic ester of formula A-COOR, wherein R is a C-Chydrocarbon group and A is a C-Csaturated or unsaturated hydrocarbon group in which at least one of the hydrogen atoms is replaced by a chlorine atom. The present disclosure also provides a process for preparing an olefinic polymer, including a polymerization step of polymerizing an olefin in the presence of the catalyst system. The present disclosure also provides an olefinic polymer made therefrom.

Catalyst for the polymerization of olefins

A process for the preparation of ethylene polymers comprising polymerizing ethylene, optionally with one or more &#x3b1;-olefin comonomers, in the presence of: (i) a solid catalyst component comprising titanium, magnesium, halogen and optionally an internal electron-donor compound, (ii) an aluminum alkyl compound, and (iii) an antistatic compound selected among the hydroxyesters with at least two free hydroxyl groups, wherein the weight ratio of aluminum alkyl compound to solid catalyst component is higher than 0.80 and the weight ratio of antistatic compound to aluminum alkyl compound is higher than 0.10.

Process for the preparation of ethylene polymers

A process for preparing a polyolefin, including polymerizing olefins in the presence of an antistatic agent made from or containing an alkylene oxide derived polymer made from or containing in average from about 10 to about 200 repeating units &#x2014;(CH&#x2014;CHR&#x2014;O)&#x2014; with R being hydrogen or an alkyl group having from 1 to 6 carbon atoms, wherein the alkylene oxide derived polymer is a random copolymer of ethylene oxide and other alkylene oxides and a ratio of n:m is in the range of from 6:1 to 1:1, wherein (n) is the average number of repeating units &#x2014;(CH&#x2014;CH&#x2014;O)&#x2014; derived from ethylene oxide and (m) is the average number of repeating units &#x2014;(CH&#x2014;CHR'&#x2014;O)&#x2014; derived from the other alkylene oxides with R&#x2032; being an alkyl group having from 1 to 6 carbon atoms, and the end groups of the alkylene oxide derived polymer are &#x2014;OH groups.

Polymerization process in the presence of antistatic agent

A process for the gas-phase polymerization of ethylene or a mixture of ethylene and one or more 1 olefins in the presence of a polymerization catalyst system comprising the steps

Process for the gas-phase polymerization of ethylene or ethylene mixtures

Catalyst component comprising Mg, Ti, and halogen atoms, and is characterized in that (a) the Ti atoms are present in an amount higher than 4% based on the total weight of the said catalyst component, (b) the amount of Mg and Ti atoms is such that the Mg/Ti molar ratio is higher than 2 and (c) by a X-ray diffraction spectrum, in which, in the range of 2&#x3b8; diffraction angles between 47&#xb0; and 52&#xb0;, at least two diffraction lines are present at diffraction angles 2&#x3b8; of 48.3&#xb1;0.2&#xb0;, and 50.0&#xb1;0.2&#xb0;, the most intense diffraction lines being the one at 2&#x3b8; of 50.0&#xb1;0.2&#xb0;, the intensity of the other diffraction line being equal to or lower than the intensity of the most intense diffraction line.

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Ferrara, Italy

Lorella Marturano