Borealis Ag

Borealis Technology Oy

Esa Kokko

Erik A Eriksson

Pauli Leskinen

Thomas Garoff

Kauno Alastalo

Magnus Palmlöf

Paivi Waldvogel

Sanjay Rastogi

Virginie Eriksson

Aki Aittola

Mika Salo

Jeroen Oderkerk

Markku Vahteri

Kalle Kallio

Yi Liu

Mikhail V Nikulin

Mats Bäckman

Marja Mustonen

Solveig Johansson

Antti Tynys

Olli Tuominen

Sara Ronca

Anneli Pakkanen

Juliane Braun

Tore Dreng

Petri Rekonen

Irfan Saeed

Janne Maaranen

Päivi Waldvogel

Albrecht Dix

Dario Romano

Jyrki Kauhanen

Tiina Vanne

Alexander Krajete

Erik Mansner

Kallio Kalle

Thomas Garroff

Laura Saarinen

Alexey Tzarev

Dmitry Konanovich

Andrei Fyodorovich Asachenko

Alexander Zelmanovich Voskoboynik

Carl-Gustav Ek

Sandeep Tyagi

Magnus Palmloef

John Severn

Harri Lylyharju

Jeanette Aumo

A process for the preparation of an ultra-high molecular weight ethylene homopolymer having a MFRof 0.01 g/10 min or less, said process comprising:

Process for the preparation of an UHMWPE homopolymer

A process for the preparation of an ultra-high molecular weight ethylene homopolymer having a MFRof 0.01 g/10 min or less, said process comprising: (I) prepolymerising at least ethylene at a temperature of 0 to 90&#xb0; C. in the presence of a heterogeneous Ziegler Natta catalyst to prepare an ethylene prepolymer having an Mw of 40,000 to 600,000 g/mol; and thereafter in the presence of the prepolymer and said catalyst; (II) polymerising ethylene at a temperature of 55&#xb0; C. or less, such as 20 to 55&#xb0; C., to prepare said UHMW ethylene homopolymer; wherein the UHMW ethylene homopolymer comprises up to 8 wt. % of said prepolymer.

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

An ethylene polymer with a density of less than 955 kg/mobtained by polymerisation with a single-site catalyst and having a shear thinning index SHIof less than 5 wherein ethylene polymer comprises two components.

Cross-linkable polyethylene resin for pipes made by a single-site catalyst

A complex containing a ligand of formula (I): 

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

Growing community of inventors

Vantaa, Finland

Esa Kokko