Borealis Ag

Borealis Polymers Oy

Borealis Technology Oy

Neste Oy

Paivi Waldvogel

Thomas Garoff

Solveig Johansson

Esa Kokko

Virginie Eriksson

Ulf Palmqvist

Arja Kostiainen

Marita Sutela

Daniel Lindgren

Aki Aittola

Kalle Kallio

Jukka Koskinen

Marja Mustonen

Pekka J Sormunen

Irfan Saeed

Kallio Kalle

Thomas Garroff

Solveig Johansonn

Peter Mann

Minna Stahlhammar

Young Ko Soo

Procatalyst comprising an inorganic support, a chlorine compound carried on said support, a magnesium compound carried on said support, a titanium compound carried on said support, and a compound comprising two oxygen containing rings, wherein said two rings are linked via a bridge selected from the group consisting of carbon bridge, silicon bridge, ethane-1.2-diyl bridge, ethene-1,2-diyl bridge, alkylaminomethyl bridge and imine bridge.

Supported donor modified ziegler-natta catalysts

Ziegler-Natta catalyzed linear low density polyethylene which satisfies the following conditions: a) a density, according to ISO 1183, of from 900 to 925 kg/m, b) a C-C-comonomer content, determined by Fourier transform infrared spectroscopy, of 1 to 16 wt % c) a weight average molecular weight Mw, determined by gel permeation chromatography, of at least 200 000, d) wherein the linear low density polyethylene comprises, by Crystallisation Analysis Fractionation (CRYSTAF) an amorphous fraction soluble at a temperature below 30&#xb0; C. of at most 10 wt % and a fraction crystallising between 60 to 75&#xb0; C. of at least 35 wt % and e) by temperature rising elution fractionation (TREF) analysis, at least 70 wt % of a crystallising polymer component having an elution temperature range from 60&#xb0; C. to 94&#xb0; C. and less than 10 wt % of a crystallising polymer component having an elution temperature range from 30&#xb0; C. to 60&#xb0; C. and, f) by Gel Permeation chromatography coupled with Fourier transform infrared spectroscopy detector (GPC-FTIR), a substantially constant short chain branching profile across the molecular weight distribution (MWD) or g) by Gel Permeation chromatography coupled with Fourier transform infrared spectroscopy instruments (GPC-FTIR), a reverse short chain branching profile across the molecular weight distribution (MWD), the linear low density polyethylene being produced in the presence of a special Ziegler-Natta procatalyst and a halogenated aluminium alkyl cocatalyst of the formula (IV) (C-C- alkyl)-Al-X, wherein X is chlorine, bromine, iodine or fluorine and m is 1 or 2.

Linear low density polyethylene with uniform or reversed comonomer composition distribution

A process is disclosed for producing a multi-modal linear low density polyethylene in at least two staged reactors connected in series, comprising (i) polymerizing in a first slurry phase stage ethylene monomers with a Ziegler-Natta polymerization catalyst system to obtain a first polyethylene fraction component (A); and (ii) polymerizing in a second gas or slurry phase stage ethylene monomers with a Ziegler-Natta polymerization catalyst system to obtain a second polyethylene fraction component (B). The Ziegler-Natta polymerization catalyst system comprises: 1) a solid procatalyst formed by contacting at least: a) a Mg-alcoholate complex of formula (I) b) an aluminum compound of formula (II); and c) a vanadium compound and a titanium compound having a molar ratio (V:Ti) from 10:90 to 90:10; and 2) one or more organometallic cocatalvsts of formula (III). The linear low density polyethylene shows an improved comonomer composition distribution Formulas (I), (II), and (III) are described herein.

Multi-stage process for producing multi-modal linear low density polyethylene

Especially homogeneous supported Ziegler-Natta catalysts may be prepared in a simple one reaction vessel process from a magnesium hydrocarbyloxy starting material which is soluble in a hydrocarbon solvent. The process comprises: (I) reacting a magnesium hydrocarbyloxy compound with a chlorine-containing compound in a non-polar hydrocarbon solvent in which said magnesium hydrocarbyloxy compound is soluble whereby to produce a solution (A); and then either: (II) contacting the solution (A) with a chlorine containing tetravalent titanium compound to produce a solution (B); (III) impregnating solution (B) into a porous particulate support; or (II) impregnating solution (A) into a porous particulate support; and (III) contacting the solid support with a chlorine containing tetravalent titanium compound; or (II) impregnating solution (A) into a porous particulate support pretreated with a chlorine containing tetravalent titanium compound.

Process for preparing a Ziegler-Natta catalyst

The invention relates to a process for the preparation of a high activity procatalyst for the production of ethylene polymers. The process according to the present invention comprises the following steps:

Procatalyst for ethylene polymer production, method for its preparation

The invention relates to a procatalyst for the production of ethylene polymers, which procatalyst comprises an inorganic support, a chlorine compound carried on said support, a magnesium compound carried on said support, a titanium compound carried on said support, whereby the chlorine compound can be different from or the same as the magnesium compound and/or the titanium compound. The activity balance AB of the procatalyst in specified polymerization conditions, is

The invention relates to a method for the preparation of a supported procatalyst intended for the polymerization of olefins, in which particles are formed from magnesium halide and alcohol, the particles are reacted with an organometallic compound of any of the metals of the groups I to III, the thus obtained particulate product is activated by means of a titanium(IV) compound, and optionally a prepolymerization is carried out for the activated particles. A problem with this kind of a method is, how to form particles from magnesium dihalide and alcohol having an advantageous structure for the polymerization of ethylene and particularly ethylene with a narrow molecular weight distribution. The problem has in the present invention been solved so that the particles are formed by spray-crystallizing a mixture of magnesium dihalide and alcohol to complex particles of magnesium dihalide and alcohol and that titanium(IV) alcoxyhalide has been used as the titanium compound. The catalytic properties of the particles thus obtained are improved, especially after the prepolymerization carried out by means of ethylene, which leads in the polymerization to a still more active, very hydrogen and comonomer sensible procatalyst having a better molecular weight selectivity. The invention also relates to the specific use of the procatalyst prepared by such a method for the polymerization of alpha-olefins. By a procatalyst is meant in this context the catalyst component of the Ziegler-Natta-catalyst which is based on the transition metal and which before the polymerization is combined with the organometallic compound of aluminium or some other metal acting as a cocatalyst.

Method for the preparation of catalyst components for the polymerization

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Porvoo, Finland

Paivi Waldvogel