Borealis Ag

Pascal Castro

Luigi Resconi

Ville Virkkunen

Alexander Z Voskoboynikov

Dmitry S Kononovich

Lauri Huhtanen

Pavel Sergeevich Kulyabin

Kalle Kallio

Dmitry Vadimovich Uborsky

Marja Mustonen

John Severn

Markus Gahleitner

Peter Denifl

Vyatcheslav V Izmer

Norbert Hafner

Noureddine Ajellal

Ismo Lehtiniemi

Anu-Leena Hongell

Vasileios Kanellopoulos

Kumudini Jayaratne

Andrey F Asachenko

Apostolos Krallis

Alexander Reznichenko

Ilya S Borisov

Alexey A Tsarev

Irfan Saeed

Janne Maaranen

Soile Rautio

Jimgbo Wang

Laurie Huhtanen

Vuokko Ojanperä

Dimitry S Kononovich

Marita Oksman

Marita Oksam

The present invention is concerned with a process for polymerizing ethylene or copolymerizing ethylene and at least one alpha-olefin comonomer in the presence of a supported polymerization catalyst in a multi-stage process in which the last polymerization stage is a gas phase reactor, the use of said process for reducing particle carry-over in the last polymerization stage and the use of a supported polymerization catalyst with a certain median particle size to polymerize an ethylene homo- or copolymer in said multi-stage process with a span of its particle size distribution which can be predicted from the median particle size of the catalyst.

Process for polymerizing ethylene in a multi-stage polymerization process

A process for the preparation of a compound of formula (V):  with a compound (VII) 

Catalyst

Process for the preparation of a solid catalyst system comprising the steps of preparing a liquid clathrate comprising a mixing of an aluminoxane, an aromatic compound and an organo-silicon compound, wherein the mol-ratio between the organo-silicon compound and aluminum of the aluminoxane is below 0.1, mixing said liquid clathrate with an organometallic compound obtaining a liquid mixture, and precipitating the solid catalyst system out of said liquid mixture by adding a saturated aliphatic compound to said mixture liquid.

Solid single site catalysts with high polymerisation activity

Asymmetrical ligands

A catalyst in solid particulate form free from an external carrier material comprising 

Catalysts

A heterophasic polypropylene resin comprising a polypropylene homopolymer matrix phase (A) and an ethylene-propylene copolymer phase (B) dispersed within the matrix, wherein the xylene soluble fraction of the heterophasic polypropylene resin is in the range 20 to less than 50 wt %; the heterophasic polypropylene resin has an MFR2 of 0.01 to 50 g/10 min; the ethylene content of the xylene soluble fraction of the heterophasic polypropylene resin is in the range of at least 20 wt % to less than 50 wt %; the heterophasic polypropylene resin has a notched charpy impact strength at &#x2212;20 C of at least 25 kJ/m, preferably at least 50 kJ/m; and wherein the MFR(Matrix)/MFR(XS)&#x2267;5, preferably &#x2267;10.

Heterophasic copolymers

A catalyst comprising (i) a metallocene complex of a group (IV) metal said metallocene comprising at least two cyclopentadienyl type ligands; (ii) a boron cocatalyst; and (iii) an aluminoxane cocatalyst; said catalyst being in solid form, preferably in solid particulate form, and being free from an external carrier.

A process for the preparation of a propylene homopolymer comprising polymerizing propylene in the presence of a catalyst comprising: (i) a metallocene complex of a group (IV) metal said metallocene comprising at least two cyclopentadienyl type ligands; (ii) a boron cocatalyst; and (iii) an aluminoxane cocatalyst; said catalyst being in solid form, preferably in solid particulate form, and being free from an external carrier; preferably wherein the melting point of the propylene polymer is controlled by adjusting the amount of or nature of the boron cocatalyst.

Polymerisation process

A process for the polymerization of at least one olefin comprising reacting said at least one olefin with a catalyst comprising: (i) a metallocene complex said metallocene comprising at least two cyclopentadienyl type ligands; (ii) a boron cocatalyst; and (iii) an aluminoxane cocatalyst; said catalyst being in solid form, preferably in solid particulate form, and being free from an external carrier.

Polymerisation process and catalyst

A racemic complex of formula (I), wherein M is zirconium or hafnium; each X is a sigma ligand; L is a divalent bridge selected from &#x2014;R'C&#x2014;, &#x2014;R&#x2032;C&#x2014;CR&#x2032;, &#x2014;R&#x2032;Si&#x2014;, &#x2014;R&#x2032;Si&#x2014;SiR&#x2032;&#x2014;, &#x2014;R&#x2032;Ge&#x2014;, wherein each R&#x2032; is independently a hydrogen atom, C-hydrocarbyl, tri(C-alkyl)silyl, C-aryl, C-arylalkyl or C-alkylaryl; Rand R&#x2032; are each independently a Chydrocarbyl radical optionally containing one or more heteroatoms from groups 14-16; R&#x2032; is a Chydrocarbyl group optionally containing one or more heteroatoms from groups 14-16 and optionally substituted by one or more halo atoms. 

A solid, particulate catalyst comprising: (i) a complex of formula (I) wherein M is zirconium or hafnium; each X is a sigma ligand; L is a divalent bridge selected from &#x2014;RC&#x2014;, &#x2014;R'C&#x2014;CR&#x2032;&#x2014;, &#x2014;R&#x2032;Si&#x2014;, &#x2014;R&#x2032;Si&#x2014;SiR&#x2032;&#x2014;, &#x2014;R&#x2032;Ge&#x2014;, wherein each R&#x2032; is independently a hydrogen atom, C1-C20-hydrocarbyl, tri(C1-C20-alkyl)silyl, C6-C20-aryl, C7-C20-arylalkyl or C7-C20-alkylaryl; each Ris a C4-C20 hydrocarbyl radical branched at the &#x3b2;-atom to the cyclopentadienyl ring, optionally containing one or more heteroatoms belonging to groups 14-16, or is a C3-C20 hydrocarbyl radical branched at the &#x3b2;-atom to the cyclopentadienyl ring where the &#x3b2;-atom is an Si-atom; each Ris a C1-C20 hydrocarbyl radical optionally containing one or more heteroatoms belonging to groups 14-16; each Ris a hydrogen atom or a C-hydrocarbyl radical; each W is a 5 or 6 membered aryl or heteroaryl ring wherein each atom of said ring is optionally substituted with at least one Rgroup; each Ris the same or different and is a C1-C20 hydrocarbyl radical optionally containing one or more heteroatoms belonging to groups 14-16; and optionally two adjacent Rgroups taken together can form a further mono or multicyclic ring condensed to W optionally substituted by one or two groups R; and each Ris a C1-C20 hydrocarbyl radical; and (ii) a cocatalyst, preferably comprising an organometallic compound of a Group 13 metal. 

Bridged metallocene catalysts

A solid particulate catalyst free from an external carrier comprising: 

Solid, particulate catalysts comprising bridged bis indenyl &#x3c0;-ligands are disclosed, together with methods for the preparation and use thereof, for example, in olefin polymerization.

Growing community of inventors

Helsinki, Finland

Pascal Castro